What the criterion actually rewards
Before choosing words, be clear what they are being judged on. Every major rubric measures vocabulary on precision, appropriacy and natural usage — and explicitly counts an inaccurate or unnatural word choice against you.
None of them award marks for rarity. A rare word used slightly wrongly is not neutral; it is a penalty. And this is the origin of the most common vocabulary mistake in the exam:
So the goal is not a bigger list. It is a usable one.
Learn functions, not topics
Here is the shift that makes vocabulary study pay. Candidates learn topic vocabulary — words about the environment, about technology, about education — and then get a prompt about urban planning.
Academic language is not mostly topic nouns. It is the language of doing things with claims: hedging them, attributing them, evaluating them, connecting them. And that language is the same in every essay, on every topic.
| Function | The words | Why it pays |
|---|---|---|
| Hedging | tends to, appears to, is likely to, arguably, in most cases, broadly | The most under-used academic language there is. See below — it is worth its own section. |
| Attributing | it is widely argued that, critics maintain, proponents claim | Lets you introduce the other side, which is what a developed argument requires. |
| Evaluating | compelling, questionable, decisive, marginal, counterproductive | Precise judgement words. Far stronger than good and bad, and completely ordinary. |
| Causing | contributes to, stems from, gives rise to, is driven by | Task 2 is mostly causal claims, and because four times is a narrow range. |
| Quantifying | a substantial proportion, a minority, the vast majority, negligible | Replaces a lot of and many, which are the two most overused words in the test. |
| Conceding | admittedly, although, while it is true that, even if | Produces a concessive clause — complex grammar and a developed argument at once. |
Six functions. Perhaps forty words. Every one of them is usable on any prompt, which is what makes them worth memorising — unlike a list of words about renewable energy, which is worth something only if you draw that question.
Hedging: the most under-used academic vocabulary there is
Learners write absolute claims. Technology has destroyed communication. Children are addicted to phones. Public transport solves congestion.
Academic English does not do this — not because academics are timid, but because an absolute claim is easy to disprove and therefore weak. The moment your reader thinks of one counter-example, your sentence is false.
| Overclaimed | Hedged |
|---|---|
| Social media makes young people lonely. | Social media appears to contribute to loneliness, at least among heavy users. |
| Free transport solves congestion. | Free transport tends to reduce congestion where the network is already good. |
| Everyone agrees that… | It is widely argued that… |
It is also, of all vocabulary work, the cheapest. Perhaps ten phrases, and they fit into any sentence you were already going to write.
The core list — and how to use it
There is a genuine, well-established core of academic vocabulary — the word families that appear across academic writing in every discipline. Roughly five or six hundred families, and they cover a very large share of the academic English you will ever need to produce.
Five or six hundred is a big number and a small one. Big, in that you will not learn it in a fortnight. Small, in that it is finite, and it is the same list for everybody, and once you have it you have most of what the criterion is asking for.
But the way you learn them decides whether they are usable:
- Learn the family, not the word. Analyse / analysis / analytical / analytically. The test rewards word formation explicitly, and knowing only the noun means you cannot use it where a verb is needed.
- Learn the collocation, not the definition. Conduct research, pose a risk, raise a concern, reach a conclusion, play a role, a compelling argument. Learning conclusion = a final decision leaves you writing make a conclusion, which is wrong and visible.
- Learn what it does to the sentence. Depend takes on. Result takes in or from, and the two are opposites. Consist takes of. Get this wrong and the word is a liability.
Which is the argument for learning fewer words, better. Fifty words you can use precisely will outscore five hundred you can recognise, every time.
A warning about speaking
Academic vocabulary belongs in academic writing. Delivered aloud in a speaking test, it is one of the clearest signals of a memorised answer.
In contemporary society, there exists a plethora of factors which contribute to this phenomenon is not something a human being says out loud, and an examiner hears it instantly. Speaking is scored on appropriacy too — and the appropriate register for a conversation is a conversational one.
In speaking, the vocabulary that scores is precise and natural: it depends on, the main thing is, that tends to happen when, I'd say it's mostly down to. Same precision. Completely different room.
Frequently asked questions
Which academic words should I learn for IELTS?
Function words rather than topic words. Learn the language of hedging (tends to, appears to, arguably), attributing (it is widely argued that), evaluating (compelling, questionable, marginal), causing (contributes to, stems from), quantifying (a substantial proportion, negligible) and conceding (admittedly, while it is true that). That is about forty words, and every one of them works on any prompt — unlike a list of words about renewable energy, which helps only if you draw that question.
Do I need to use rare words to get a high vocabulary score?
No, and reaching for them is the most common way candidates lose marks on the criterion. Every major rubric measures precision, appropriacy and natural usage, and explicitly counts an inaccurate or unnatural word choice against you — so a rare word used slightly wrongly is a penalty rather than a neutral. A common word used exactly beats an uncommon word used approximately, at every band.
What is hedging and why does it matter?
Hedging is qualifying a claim — 'tends to', 'appears to', 'in most cases', 'arguably' — and it is the most under-used academic vocabulary in candidate writing. Learners write absolute claims, which are easy to disprove and therefore weak. Hedging earns on two criteria at once: vocabulary, because those phrases are precise academic usage, and task response, because an overclaim is an unsupported claim and hedging turns an assertion you cannot defend into one you can.
How should I learn academic vocabulary?
Learn fewer words, better. Learn the whole word family (analyse, analysis, analytical), because word formation is explicitly scored and knowing only the noun means you cannot use it where a verb is needed. Learn the collocation rather than the definition — 'reach a conclusion', not 'conclusion = a final decision', which leaves you writing 'make a conclusion'. And learn the preposition the word takes, because 'result in' and 'result from' are opposites.
Should I use academic vocabulary in the speaking test?
Not the written kind. 'In contemporary society, there exists a plethora of factors' is not something anyone says out loud, and it is one of the clearest signals of a memorised answer — which examiners discount. Speaking is scored on appropriacy too, and the appropriate register for a conversation is conversational: 'it depends on', 'that tends to happen when', 'I'd say it's mostly down to'. Same precision, different room.