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100 Must-Know IELTS Vocabulary Words — Organised by Topic With Flashcard Tips
Vocabulary is the single biggest factor separating a Band 6 from a Band 7+ on the IELTS exam. The right words help you understand dense reading passages, catch key details in listening recordings, express precise ideas in writing, and impress examiners during speaking. This guide gives you the 100 most important IELTS vocabulary words — carefully selected from past exams, the Academic Word List, and official Cambridge IELTS materials.
Every word on this list has been chosen because it appears frequently in IELTS Reading and Listening passages and because it is the kind of word that examiners reward in Writing Task 2 and the Speaking test. These are not obscure, literary terms. They are practical, high-value words that you can learn with flashcards and start using immediately.
We have organised the full list by common IELTS topics so you can study them in meaningful clusters — the way your brain naturally retains vocabulary. At the end, you will find a step-by-step study plan for learning all 100 words using spaced repetition flashcards.
IELTS examiners assess your vocabulary in two key ways. In Reading and Listening, you need receptive vocabulary — the ability to recognise and understand words quickly. In Writing and Speaking, you need productive vocabulary — the ability to recall and use words accurately, with correct collocations and appropriate register. A strong vocabulary directly impacts your Lexical Resource score, which accounts for 25% of your Writing and Speaking band scores.
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Reading
Recognise paraphrased ideas and synonyms instantly. These 100 words cover the most common substitutions IELTS uses to test comprehension.
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Writing
Use precise, academic vocabulary in Task 2 essays. Examiners reward range and accuracy — these words give you both.
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Speaking
Demonstrate lexical range in Parts 2 and 3. Using topic-specific vocabulary naturally signals Band 7+ competence.
Research consistently shows that targeted vocabulary study — especially with spaced repetition flashcards — is one of the fastest ways to improve your IELTS score. A Cambridge University meta-analysis found that spaced learning produces nearly three times the retention of cramming. These 100 words, studied consistently over four to six weeks, can make a measurable difference on exam day.
We have grouped these words into ten topic clusters that appear repeatedly across all four IELTS sections. Studying words in thematic groups helps your brain form stronger associations, making recall faster under exam pressure. Each word includes a brief definition and an example sentence you can use in Writing Task 2 or Speaking Part 3.
1. Education and Learning
Word
Definition & Example
Curriculum
The subjects and content taught in a school or programme. "The national curriculum should include financial literacy."
Pedagogy
The method and practice of teaching. "Modern pedagogy emphasises student-centred learning."
Literacy
The ability to read and write; competence in a specific area. "Digital literacy is now as important as traditional literacy."
Tuition
Teaching or instruction, especially individually or in small groups; also fees for education. "Rising tuition fees have made higher education less accessible."
Undergraduate
A university student who has not yet completed a first degree. "Most undergraduate programmes last three to four years."
Compulsory
Required by law or a rule; obligatory. "Compulsory education typically ends at age 16 in many countries."
Vocational
Relating to practical skills and training for a specific job. "Vocational training can be just as valuable as academic study."
Discipline
A branch of knowledge; also self-control and orderly behaviour. "Combining disciplines leads to more innovative research."
Enrol
To officially register for a course or institution. "The number of students enrolled in online courses has doubled."
Scholarship
A grant of money awarded to a student for academic achievement. "Scholarships help students from low-income families access university."
2. Environment and Nature
Word
Definition & Example
Sustainable
Able to continue without depleting natural resources. "Sustainable agriculture protects both the environment and food supply."
Biodiversity
The variety of plant and animal life in a habitat. "Deforestation poses a serious threat to biodiversity."
Emission
The release of gas, heat, or radiation into the atmosphere. "Governments must reduce carbon emissions to meet climate targets."
Renewable
A resource that is not depleted when used, such as solar or wind energy. "Investment in renewable energy has increased dramatically."
Conservation
The protection and preservation of natural environments and wildlife. "Marine conservation efforts have helped restore coral reef populations."
Deforestation
The clearing or removal of forests on a large scale. "Deforestation in tropical regions contributes significantly to climate change."
Ecosystem
A community of living organisms interacting with their environment. "Polluted rivers disrupt entire freshwater ecosystems."
Contaminate
To make something impure by exposure to a harmful substance. "Industrial waste can contaminate groundwater supplies."
Deplete
To use up or reduce the quantity of a resource. "Overfishing has severely depleted fish stocks in the Atlantic."
Habitat
The natural home or environment of an animal or plant. "Urban expansion continues to destroy natural habitats."
3. Technology and Innovation
Word
Definition & Example
Innovation
The introduction of new ideas, methods, or products. "Technological innovation drives economic growth in modern societies."
Automate
To convert a process to operate with minimal human intervention. "Factories that automate production can reduce costs significantly."
Obsolete
No longer in use; outdated. "Rapid technological change makes some skills obsolete within years."
Surveillance
Close observation, especially of a suspected person or place. "The expansion of surveillance technology raises privacy concerns."
Artificial
Made or produced by human beings rather than occurring naturally. "Artificial intelligence is transforming healthcare diagnostics."
Breakthrough
A sudden, important discovery or development. "Scientific breakthroughs often take decades of incremental research."
Digital
Involving or relating to computer technology and the internet. "The digital divide between urban and rural areas remains significant."
Infrastructure
The basic physical systems of a society, such as roads, power, and communications. "Investing in digital infrastructure is essential for economic competitiveness."
Revolutionise
To change something radically or fundamentally. "The internet has revolutionised the way people access information."
Implement
To put a plan or decision into effect. "Governments must implement stricter regulations on data privacy."
4. Health and Wellbeing
Word
Definition & Example
Epidemic
A widespread occurrence of a disease in a community. "The obesity epidemic affects millions of people worldwide."
Sedentary
Characterised by much sitting and little physical activity. "A sedentary lifestyle increases the risk of heart disease."
Nutrition
The process of providing or obtaining food necessary for health and growth. "Good nutrition during childhood has lifelong health benefits."
Diagnosis
The identification of a disease or condition through examination. "Early diagnosis significantly improves survival rates for many cancers."
Chronic
Persisting for a long time, often referring to illness. "Chronic stress can have serious consequences for mental health."
Preventive
Designed to stop something undesirable from happening. "Preventive healthcare reduces long-term medical costs."
Wellbeing
The state of being comfortable, healthy, and happy. "Employers are increasingly investing in employee wellbeing."
Symptom
A physical or mental sign of a disease or condition. "Fatigue is a common symptom of iron deficiency."
Therapy
Treatment intended to relieve or heal a disorder. "Cognitive behavioural therapy is effective for treating anxiety."
Outbreak
A sudden occurrence of disease or conflict. "Disease outbreaks often spread fastest in densely populated areas."
5. Society and Culture
Word
Definition & Example
Inequality
The state of not being equal, especially in status or opportunity. "Income inequality has widened in many developed nations."
Demographic
Relating to the structure of populations. "Demographic shifts are creating new challenges for pension systems."
Migration
The movement of people from one region or country to another. "Rural-to-urban migration is accelerating in developing countries."
Integration
The process of combining or incorporating parts into a whole. "Successful integration of immigrants benefits both communities."
Heritage
Valued traditions, sites, or objects inherited from previous generations. "Preserving cultural heritage is essential for national identity."
Stereotype
A widely held, oversimplified image or idea of a particular group. "Media portrayals can reinforce harmful stereotypes about minorities."
Diverse
Showing a great deal of variety; including people of different backgrounds. "Diverse teams tend to produce more creative solutions."
Marginalise
To treat a person or group as insignificant or peripheral. "Economic policies can marginalise vulnerable communities."
Cohesion
The action of forming a united whole; social unity. "Social cohesion depends on equal access to public services."
Assimilate
To absorb and integrate into a wider society or culture. "Immigrants often face pressure to assimilate into their new culture."
6. Economy and Work
Word
Definition & Example
Globalisation
The process of international integration through trade, technology, and culture. "Globalisation has created both opportunities and challenges for developing economies."
Unemployment
The state of being without a paid job. "Youth unemployment remains a critical issue across Europe."
Productivity
The efficiency of production measured by output per unit of input. "Remote working has had mixed effects on employee productivity."
Inflation
A general increase in prices and fall in the purchasing power of money. "High inflation erodes the savings of ordinary citizens."
Revenue
Income generated from business activities or taxation. "Tourism revenue accounts for a large share of GDP in many island nations."
Subsidise
To support financially, often by a government grant. "Many governments subsidise renewable energy to encourage adoption."
Commodity
A raw material or primary product that can be bought and sold. "Oil remains one of the world's most traded commodities."
Entrepreneur
A person who starts and runs a business, taking on financial risk. "Young entrepreneurs are driving innovation in the technology sector."
Outsource
To obtain goods or services from an outside supplier. "Many companies outsource manufacturing to reduce labour costs."
Fiscal
Relating to government revenue, especially taxes. "Sound fiscal policy is essential for long-term economic stability."
7. Government and Law
Word
Definition & Example
Legislation
Laws considered collectively; the process of making laws. "New legislation aims to reduce plastic waste by 50%."
Regulation
A rule or directive made by an authority. "Stricter regulation of social media platforms is being debated globally."
Bureaucracy
A system of government with complex rules and procedures. "Excessive bureaucracy can slow down business development."
Transparency
Openness and accountability in decision-making. "Greater transparency in government reduces corruption."
Jurisdiction
The official power to make legal decisions and judgements. "Online crimes often fall outside national jurisdictions."
Enforce
To compel observance of a law or rule. "It is one thing to pass a law and another to enforce it effectively."
Prohibit
To formally forbid by law or authority. "Several countries have moved to prohibit single-use plastics."
Amend
To make minor changes to a law or document to improve it. "The constitution has been amended several times since its adoption."
Advocate
To publicly support or recommend a particular cause or policy. "Environmental groups advocate for stricter pollution controls."
Referendum
A general vote by the public on a single political question. "The government held a referendum on constitutional reform."
8. Urbanisation and Transport
Word
Definition & Example
Urbanisation
The process of making an area more urban; population shift to cities. "Rapid urbanisation puts pressure on housing and public services."
Congestion
Overcrowding, especially of traffic or people. "Traffic congestion costs major cities billions in lost productivity."
Commute
To travel regularly between home and work. "Long commutes reduce quality of life for suburban workers."
Sprawl
The uncontrolled expansion of urban areas into surrounding land. "Urban sprawl has destroyed farmland on the outskirts of many cities."
Pedestrian
A person walking rather than travelling in a vehicle. "Pedestrian-friendly city centres improve public health and reduce emissions."
Suburb
A residential area on the outskirts of a city. "Many families prefer suburbs for their larger homes and green spaces."
Sanitation
Conditions relating to public health, especially clean water and waste disposal. "Improving sanitation infrastructure saves millions of lives each year."
Renovate
To restore a building to a good state of repair. "Renovating old buildings is often more sustainable than demolishing them."
Zoning
The division of land into areas designated for different uses. "Mixed-use zoning can create more walkable, vibrant neighbourhoods."
Density
The degree of compactness; population per unit of area. "High population density strains public transport systems."
9. Media and Communication
Word
Definition & Example
Bias
An unfair preference for or against something. "Media bias can shape public opinion on political issues."
Misinformation
False or inaccurate information, especially when spread unintentionally. "The spread of misinformation on social media is a growing concern."
Censorship
The suppression of speech, communication, or information by an authority. "Censorship of the press undermines democratic principles."
Broadcast
To transmit a programme or information by radio, television, or internet. "News is now broadcast instantly through multiple digital channels."
Credibility
The quality of being trusted and believed in. "Journalists must maintain their credibility through fact-based reporting."
Viral
Spreading rapidly and widely through online sharing. "Viral content can reach millions of people within hours."
Propaganda
Information used to promote a political cause or point of view, often misleading. "Propaganda was widely used during wartime to influence public opinion."
Objective
Not influenced by personal feelings; based on facts. "Objective reporting requires presenting multiple perspectives."
Disseminate
To spread information widely. "Social media allows organisations to disseminate information rapidly."
Literacy (media)
The ability to critically analyse and evaluate media content. "Media literacy should be taught in schools from an early age."
10. Academic and General Purpose
Word
Definition & Example
Significant
Important enough to have an effect or be noticed. "There has been a significant increase in online learning."
Predominant
Present as the strongest or main element. "English is the predominant language of international business."
Inevitable
Certain to happen; unavoidable. "Some degree of cultural change is inevitable in a globalised world."
Contradict
To assert the opposite of a statement; to be inconsistent with. "The new findings contradict earlier research on the topic."
Mitigate
To make something less severe, serious, or painful. "Governments must take steps to mitigate the effects of climate change."
Fluctuate
To rise and fall irregularly. "Oil prices tend to fluctuate in response to geopolitical events."
Phenomenon
A fact or event that is observed or can be studied. "Climate change is a global phenomenon affecting every continent."
Implication
A likely consequence or effect; something suggested without being stated. "The implications of artificial intelligence for employment are profound."
Correlation
A mutual relationship between two or more things. "There is a strong correlation between education levels and income."
Consensus
A general agreement among a group. "There is now a scientific consensus that human activity drives climate change."
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Knowing 100 high-value words deeply is far more powerful than recognising 500 words vaguely. Depth beats breadth on the IELTS.
style Browse our ready-made IELTS vocabulary collections with built-in spaced repetition.
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Having a word list is only the starting point. The difference between learners who master these words and those who forget them within a week comes down to how they study. Here is a proven four-week plan using spaced repetition flashcards.
Week 1: Topics 1–3 (Education, Environment, Technology)
Add 5 new words per day from the first three topic groups. Each flashcard should have the word on the front and the definition plus one example sentence on the back. Review all accumulated cards daily — your spaced repetition app will handle the scheduling. By the end of the week, you will have 30 words in active review.
Week 2: Topics 4–6 (Health, Society, Economy)
Continue adding 5 new words per day from the next three topics while reviewing all previous cards. By now, the algorithm will be showing Week 1 words less frequently since you are getting them right, freeing up time for new material. Total words in review: 60.
Week 3: Topics 7–10 (Government, Urbanisation, Media, Academic)
Complete the final four topic groups. At this point, daily reviews should take about 15–20 minutes as the algorithm efficiently resurfaces only the words you need to see. Total words in review: 100.
Week 4: Production Practice and Active Use
Stop adding new cards. Focus entirely on reviews and active production. Write practice essay paragraphs using at least 5 words from your flashcard deck per paragraph. Record yourself speaking on IELTS topics using the vocabulary naturally. This transition from recognition to production is what separates Band 6 from Band 7+ candidates.
help "Are these 100 words enough to get Band 7+?"
These 100 words are a strong foundation, not a complete vocabulary. Band 7+ typically requires an active vocabulary of 7,000–8,000 word families. However, these 100 words cover the highest-frequency academic and topic-specific terms that examiners look for. Mastering them gives you a significant boost in Lexical Resource scoring and a platform to build on.
help "Should I learn these words with definitions in English or my native language?"
Both approaches have merit. English-to-English definitions build deeper understanding and help you think in English during the exam. However, if you are at a B1 or lower level, starting with native-language translations gets you moving faster. Platforms like Penguen.io support multiple languages, so you can start with your native language and transition to English definitions as your confidence grows.
help "How long should I study flashcards each day?"
For this 100-word list, 15–20 minutes per day is ideal. Research shows that short, consistent sessions outperform long, irregular study marathons. The key is daily consistency — ten minutes every day for four weeks beats two hours once a week. Spaced repetition makes each minute count by focusing your time on the words you find hardest.
help "Do these words apply to both IELTS Academic and General Training?"
Yes. While IELTS Academic has a slightly stronger emphasis on formal and academic vocabulary, all 100 words on this list are useful for both versions. They appear in Reading passages across both tests and strengthen your Writing and Speaking performance regardless of which module you are taking.
The 100 words in this guide represent the highest-value vocabulary for IELTS success. They span the ten most common exam topics, they are drawn from the Academic Word List and past Cambridge IELTS materials, and they are exactly the kind of words that examiners reward when you use them naturally and accurately.
But knowing which words to learn is only half the battle. How you study them determines whether they stick. Flashcards with spaced repetition — the method backed by decades of cognitive science research — give you the most efficient path from seeing a word for the first time to using it confidently under exam conditions.
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The difference between a Band 6 and a Band 7 often comes down to 100 well-chosen words, learned deeply and used precisely.
Ready to begin? Penguen.io offers curated IELTS vocabulary flashcard decks — including all 100 words from this guide — with built-in spaced repetition, multilingual support, and progress tracking. Whether you are starting from scratch or fine-tuning for your target band score, it gives you the tools to make every study session count. Browse IELTS flashcard collections and start your first deck today.