IELTS Writing Vocabulary: Precision Beats Length

A candidate learns fifty advanced words, uses eight of them in an essay, and scores 6 for Lexical Resource. This happens constantly, and the reason is simple. The criterion does not reward rare vocabulary. It rewards vocabulary used accurately.

A long word in the wrong place is a clearer error than a common word in the right place. This page shows what the difference looks like in real sentences, and how to build a vocabulary that raises your band rather than decorating your answer.

What Lexical Resource is actually measuring

Lexical Resource is one of the four criteria, each worth a quarter of your writing score. The public band descriptors describe it in terms of three things:

1. Range. Do you have enough words to handle the topic, and some less common ones?
2. Accuracy. Are the words you chose the right words, in the right form, with the right partners?
3. Appropriacy. Does the register fit an academic or semi formal answer?

Notice that range is one of three, and it is the only one most candidates study for. Accuracy covers spelling, word form and, crucially, collocation. Collocation means which words naturally go together. English speakers say heavy rain and not strong rain, make a decision and not do a decision. These pairings are not logical; they are conventional, and getting them wrong is visible immediately.

A word you half know is a liability. A word you fully know is an asset, even if it is ordinary.

Twelve pairs where the longer word is the wrong word

Each row shows the upgrade a candidate reaches for, and what a marker sees.

Every left hand column entry is an attempt to sound advanced. Every one of them tells a marker that the word was learned from a list rather than from reading.

The rule that replaces word lists

Learn words in phrases, never alone.

A word on a flashcard gives you a meaning. A phrase gives you the grammar, the collocation and the register at the same time. Compare:

• Flashcard: mitigate = to reduce something bad
• Phrase: mitigate the effects of climate change

The flashcard produces "we should mitigate the poor people". The phrase produces a correct sentence, because you stored the partners along with the word.

When you meet a useful word, write down the whole chunk it appeared in. Three chunks you can deploy accurately are worth more than thirty words you can only define.

Precision is not the same as simplicity

None of this is an argument for writing simply. It is an argument for writing exactly. Compare three versions of the same idea:

Version A: Cars are bad for the environment because they make a lot of pollution.

Accurate, but the vocabulary is entirely common and the idea is unextended. This is band 5 or 6 territory for Lexical Resource.

Version B: Automobiles are detrimentally catastrophic to the ecological biosphere due to their voluminous emanations.

Every content word has been swapped for a longer one. Detrimentally catastrophic is a redundant pair, ecological biosphere repeats itself, and emanations is the wrong noun. This scores lower than Version A, not higher.

Version C: Private cars are a major source of urban air pollution, since a single vehicle emits carbon dioxide and fine particulates on every journey.

The vocabulary here is precise rather than rare: source, emit, particulates, urban. Each word is doing a job that a simpler word could not do as exactly. This is what the descriptors mean by less common vocabulary used accurately.

Topic vocabulary worth having

Most Task 2 questions come from a small set of themes. Building twenty accurate chunks per theme covers most of what you will need.

Environment: carbon emissions, renewable energy, single use plastic, conservation efforts, a shift towards cleaner fuels.

Education: the school curriculum, vocational training, tuition fees, rote learning, critical thinking skills.

Work: job security, a flexible working arrangement, the skills gap, career progression, an unpaid internship.

Technology: digital literacy, screen time, automation of routine tasks, data privacy, online misinformation.

Health: a sedentary lifestyle, preventive care, public health campaigns, processed food, mental wellbeing.

Notice that almost none of these are rare words. They are ordinary words in the combinations that native writers actually use, which is the thing that reads as competent.

A five minute check before you submit

In the last minutes of the exam, scan your answer for these four things.

1. Any word you are not certain about. If you cannot say who or what the word normally goes with, replace it with the plain word you are sure of. An accurate plain word costs nothing; an inaccurate rare word costs marks.
2. Word form. Check that adjectives are not sitting where nouns belong: the pollution is danger should be the pollution is dangerous.
3. Repetition of the key noun. If the topic word appears in every sentence, replace two of them with a pronoun or a broader term.
4. Register. Remove contractions, a lot of, kids, stuff, and rhetorical questions. Academic tone is neutral, not formal for its own sake.

What to do today

Take an essay you have already written. Underline every word you chose because it sounded advanced. For each one, write out the phrase it belongs in, and check it against a learner dictionary that shows collocations. Replace any word whose partners you cannot state.

Then write the paragraph again with your safest accurate vocabulary and extend the ideas instead. The band usually goes up, because two criteria improve at once.

If you want to see which specific words a marker would flag, paste the answer into Bandly: it returns a band estimate for each of the four criteria, with the phrases that drove the Lexical Resource judgement highlighted in your own text.