IELTS vocabulary: how many words you need, collocations and topic lists (2026)

The most common misconception about IELTS vocabulary is that a difficult word equals a high score. In fact the Lexical Resource criterion measures precision, flexibility and collocation; a misplaced rare word lowers the score. This guide explains how vocabulary works across the four sections, which word groups the Task 2 topics need, why memorised phrases hurt, and how to learn words so they stay.

Vocabulary works differently in the four sections

So for Listening and Reading vocabulary means passive recognition, for Writing and Speaking active use. They are not the same thing: many candidates recognise 8,000 words and write with 800.

What Lexical Resource demands at band 7

The gist of the official descriptors: use vocabulary flexibly and precisely, use less common items with some awareness of style and collocation, occasional errors in word choice are allowed. Three practical consequences:

1. Precision beats quantity. "Environmental damage" and "ecological harm" are not the same; the first is general, the second narrow. Choosing the right one is the mark.
2. Collocation beats the word. "Make a research" is wrong; "do research" or "conduct research" is right. Not "strong rain" but "heavy rain". The examiner hears a collocation error instantly.
3. Register fit. An essay says "children", not "kids"; in Speaking, the reverse, "children" can sound cold.

Word groups for the Task 2 topics

The Task 2 topics are limited; knowing 20 to 30 precise words and collocations for each gives more than 500 general "academic words".

• Education: curriculum, tuition fees, vocational training, lifelong learning, drop out of school, academic pressure
• Environment: carbon emissions, renewable energy, deforestation, single-use plastics, a carbon footprint, climate legislation
• Technology: screen time, data privacy, automation, remote work, digital literacy
• Health: a sedentary lifestyle, processed food, preventive care, public health campaign, life expectancy
• Work: job security, work-life balance, a gig economy, career progression, retraining
• Society: an ageing population, income inequality, urbanisation, social cohesion, cultural heritage

Learn them not as a list but by writing an essay per topic: one essay per topic, five new collocations in each.

Why the memorised phrase hurts

"In this day and age", "a double-edged sword", "every coin has two sides", "it is undeniable that" are familiar to the examiner from thousands of essays. They carry no content, only occupy space, and the examiner may rate them as memorised material. Use the precise topic word instead: a concrete sentence like "Baku's air quality data shows…" raises the score where "undeniable" does not.

Forced synonyms hurt for the same reason: if "important" is swapped for "paramount, crucial, vital" every time, a collocation error is inevitable. Change the word when the meaning changes, not for the counter.

Paraphrase: the skill that joins Reading, Listening and Writing

Paraphrase is needed in two places: in Reading and Listening you must recognise it, in Writing you must produce it (restating the question in your own words in the Task 2 introduction). Three techniques: a synonym ("children" → "young people"), a change of word class ("pollute" → "pollution"), a change of structure (active → passive). Our paraphrase tool shows how much your sentence has changed.

How to learn words for the long term

• Learn chunks, not words: "take a photo", "heavy traffic", "depend on". A word's surroundings are its correct use.
• Active recall: from the meaning in your language to the English word, not the other way. Recognising is easy; recalling is the mark.
• Spaced repetition: today, in three days, in a week, in a month.
• Your own sentence: use the new chunk twice, in a Speaking answer or an essay; an unused word leaves.
• Five to eight chunks a day is enough; a list of forty is gone within a week.

False friends and collocation traps for AZ and RU speakers

• make / do: "do homework", "make a decision", "do research", "make progress".
• magazine ≠ mağaza / магазин ("shop/store"); accurate ≠ akkurat / аккуратный ("neat"), it means "precise".
• actual ≠ aktual / актуальный ("current, topical"), it means "real".
• sympathetic ≠ simpatik / симпатичный ("nice-looking"), it means "understanding".
• Preposition collocations: "depend on", "consist of", "interested in", "good at". They do not map one to one onto AZ case endings or RU cases, so learn them in pairs.
• Not "open/close the light" but "turn on/off the light"; the difference between learn and teach.

Next step

The Task 2 essay tests vocabulary hardest: the Writing Task 2 strategy guide gives the structure, and the Writing band descriptors open up what Lexical Resource means at each band. The systematic first-language mistakes are collected in common English mistakes by AZ speakers.