IELTS Vocabulary
IELTS Vocabulary by Topic: Word Lists, Collocations and Synonyms
The vocabulary that consistently appears across IELTS Writing and Speaking topics, organised by subject, plus the synonyms and collocations that replace the overused words most candidates default to under exam pressure.
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Why vocabulary is worth so many marks
Lexical Resource is one of the four criteria examiners use to mark both Writing and Speaking, worth a full 25 percent of each. It isn't simply about using long or unusual words. Examiners are trained to reward precise, natural vocabulary used correctly in context, and to penalise vocabulary that is repetitive, imprecise, or used incorrectly in an attempt to sound advanced.
Range
Do you draw on a wide enough vocabulary to avoid repeating the same words across an answer, in both Writing and Speaking?
Precision
Do you choose the word that most accurately captures your meaning, rather than the first word that comes to mind?
Naturalness
Do less common words and collocations appear in places a fluent speaker or writer would actually use them, rather than forced in artificially?
Spelling and word formation
In Writing specifically, are words spelled correctly and formed correctly, for example using "success" as a noun and "successful" as the adjective?
Vocabulary by topic
These eight topics account for a large share of IELTS Writing Task 2 essay prompts and IELTS Speaking Part 3 discussion questions. Build familiarity with the core nouns, verbs and collocations for each rather than memorising full sentences.
Environment
Common in Writing Task 2 & Speaking Part 3Key vocabulary
- carbon emissions, greenhouse gases
- renewable energy, fossil fuels
- deforestation, biodiversity
- sustainable, eco-friendly
Collocations
- tackle climate change
- reduce your carbon footprint
- raise environmental awareness
Technology
Common in Writing Task 2 & Speaking Part 3Key vocabulary
- artificial intelligence, automation
- digital literacy
- social media, screen time
- innovation, breakthrough
Collocations
- keep up with technology
- rely heavily on technology
- bridge the digital divide
Education
Common in Writing Task 2 & Speaking Part 1/3Key vocabulary
- curriculum, syllabus
- higher education, vocational training
- rote learning, critical thinking
- tuition fees, student debt
Collocations
- acquire a skill
- broaden your horizons
- fall behind academically
Health
Common in Writing Task 2 & Speaking Part 1/3Key vocabulary
- sedentary lifestyle
- life expectancy
- preventative healthcare
- obesity, malnutrition
Collocations
- lead a healthy lifestyle
- put a strain on healthcare systems
- raise public awareness
Crime and punishment
Common in Writing Task 2Key vocabulary
- deterrent, rehabilitation
- reoffend, recidivism
- juvenile crime
- capital punishment
Collocations
- commit a crime
- serve a sentence
- tackle the root cause
Work and career
Common in Speaking Part 1/3 & Writing Task 2Key vocabulary
- job satisfaction, work-life balance
- remote working, flexible hours
- redundancy, job security
- career progression
Collocations
- climb the career ladder
- strike a balance
- burn out
Globalisation
Common in Writing Task 2Key vocabulary
- multinational corporation
- cultural homogenisation
- outsourcing, offshoring
- interconnected, interdependent
Collocations
- foster cultural exchange
- widen the wealth gap
- open up new markets
Urbanisation
Common in Writing Task 2Key vocabulary
- urban sprawl
- public transport infrastructure
- overcrowding, congestion
- gentrification
Collocations
- ease traffic congestion
- place a burden on infrastructure
- revitalise a neighbourhood
Synonyms for overused words
Examiners notice when the same handful of words carries an entire answer. These common words are the easiest and highest-impact ones to build alternatives for.
| Overused word | Stronger alternatives |
|---|---|
| good | beneficial, advantageous, valuable, worthwhile |
| bad | detrimental, harmful, damaging, adverse |
| important | crucial, significant, essential, paramount |
| many | numerous, a considerable number of, a great deal of |
| show | demonstrate, reveal, indicate, illustrate |
| think | believe, consider, argue, maintain |
| change | shift, transform, alter, evolve |
| big | substantial, considerable, significant, sizeable |
| small | minor, marginal, negligible, modest |
| increase | rise, grow, surge, climb |
| decrease | decline, fall, drop, diminish |
| problem | issue, challenge, drawback, obstacle |
Use these as a starting bank, not a substitution rule. The right word depends on precise meaning and natural collocation, so check each alternative fits the exact sentence before using it.
Useful collocations
Collocations, words that naturally pair together, are one of the fastest ways to sound like a fluent user of English rather than someone translating word by word. These general-purpose collocations apply across almost any IELTS topic.
| Collocation | Typical use |
|---|---|
| play a vital role in | describing importance or contribution |
| have a significant impact on | describing cause and effect |
| give rise to | introducing a consequence |
| strike a balance between | discussing trade-offs |
| address the issue of | introducing a problem to be discussed |
| widely regarded as | reporting a common opinion |
| a growing body of evidence | referring to research or trends |
| outweigh the drawbacks | concluding an advantages/disadvantages discussion |
Common vocabulary mistakes
- Using memorised "advanced" phrases in the wrong context. Examiners are trained to spot vocabulary that has clearly been learned and inserted rather than used naturally, and this can cost marks rather than gain them.
- Treating uncountable nouns as countable. Words like "information", "advice", "research" and "equipment" have no plural form; "informations" and "an advice" are both errors that stand out immediately.
- Confusing word forms. Mixing up "economic" and "economical", or using "success" where "successful" is needed, is a Lexical Resource error even when the underlying idea is correct.
- Using overly casual language in Writing Task 2. Contractions, phrasal verbs like "a lot of" instead of "a great deal of", and colloquial expressions suit Speaking but lower the register expected in a formal essay.
- Being too formal in Speaking. The reverse also costs marks. Speaking rewards natural, conversational vocabulary, so overly bookish phrasing can sound rehearsed and unnatural.
- Repeating the exact word from the question. Both Writing and Speaking reward paraphrasing. Reusing the question's own key words without any variation is a missed opportunity to demonstrate range.
Want vocabulary built directly into full model answers?
Every Band 9 Masterclass includes the high-scoring vocabulary, collocations and phrases for that skill, shown in context inside real model answers rather than as an isolated list to memorise.
Explore the Band 9 Masterclass BundleFrequently asked questions
Should I memorise long lists of advanced vocabulary before my IELTS test?
No. Examiners can usually tell when vocabulary has been memorised rather than genuinely understood, and misused advanced words cost more marks than they gain. It's more effective to learn a smaller set of words and collocations thoroughly enough to use them naturally and correctly.
Is it better to use simple words correctly or complex words incorrectly?
Simple words used correctly. Lexical Resource rewards precision and natural use over raw difficulty, and a correctly used common word will always outscore a misused advanced one.
Do I need different vocabulary for Writing and Speaking?
The underlying topic vocabulary overlaps heavily, but register differs. Writing Task 2 expects a more formal register, while Speaking rewards natural, conversational language, so the same idea is often expressed differently in each.
How many new words should I learn per topic?
Around 10 to 15 well-understood words and collocations per topic is usually more useful than 50 that are only half learned, since you need to be able to use each one accurately and naturally under exam pressure.
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