Why big words do not raise your Lexical Resource band
Rare vocabulary used wrongly scores below common vocabulary used precisely. What the descriptors ask for, with band 6 and band 7 rewrites.
Band descriptorsWritingUpdated 6 min read
A rare word used wrongly scores below a common word used precisely. That is not consolation for the cautious; it is what the Lexical Resource descriptors say, read literally. Band 7 asks you to use "a sufficient range of vocabulary to allow some flexibility and precision", and to use less common items "with some awareness of style and collocation", tolerating only "occasional errors in word choice". Band 6 is exactly where "attempts to use less common vocabulary" meets "some inaccuracy". So a candidate who reaches for ameliorate and attaches the wrong object has bought a band 6 feature at the price of a band 7 one. Ordinary vocabulary can indeed cap you at band 6 — but no descriptor line rewards rarity in itself, so ask what a rarer replacement is supposed to add.
What the criterion is actually measuring
Task 2 is marked on four equally weighted criteria: Task Response, Coherence and Cohesion, Lexical Resource, and Grammatical Range and Accuracy — each one unpacked against a full graded essay in what band 7 actually requires, criterion by criterion. Vocabulary is a quarter of your Writing band, no more, and the descriptors for that quarter name range, flexibility, precision, collocation and awareness of style, plus accuracy in word choice, word formation and spelling. Rarity is not on the list. "Less common" does appear in the wording, but never on its own: at band 7 it is chained to some awareness of style and collocation, and at band 8 to skilfully. The rare word is only credited once you have shown you can control it.
Showy vocabulary is therefore a bad bet under exam conditions: a word you half-know costs you twice, failing to convey the precise meaning and registering as an error in word choice. The same instinct produces thesaurus-swapped introductions, and what paraphrasing actually rewards at band 7 takes that half of the myth apart.
The same sentence, three ways
One idea about urban transport funding, written three ways; the content is identical in every row.
| Version | The sentence | What the descriptors do with it |
|---|---|---|
| Plain | "Cities should spend more money on public transport, because cars cause most of the air pollution in cities." | Accurate and clear, but the range is merely adequate: spend money, cause, cities twice. Nothing wrong, nothing to credit: the honest band 6 ceiling. |
| Showy and wrong | "Municipalities ought to disburse augmented pecuniary resources towards communal conveyance, as automobiles engender the preponderance of metropolitan atmospheric contamination." | Four collocation failures (disburse takes payments, not budgets; none of augmented resources, communal conveyance or atmospheric contamination is a natural combination in an essay), plus a register clash with the writing around it. Errors in word choice and no awareness of style: band 6 or lower, on a sentence written to impress. |
| Precise and collocated | "Cities should shift more of their transport budgets towards buses and rail, since private vehicles account for the bulk of urban air pollution." | Shift a budget, account for, the bulk of, urban air pollution: real collocations, each adding meaning the plain version lacked. Shift says the money is moved, not created; account for attributes a share without overclaiming. Flexibility and precision, in the band 7 wording, and only bulk is remotely uncommon. |
What separates row three from row one is not rarity. It is a verb that carries a claim (shift instead of spend), a quantifier honest about proportion (the bulk of), and a compound noun that names the thing exactly (urban air pollution). Every one of those words is already in a competent band 6 candidate's vocabulary. Band 7 is the decision to use them in the right company.
The substitution test
Run this on your practice essays, sentence by sentence; it separates vocabulary you own from vocabulary you are borrowing.
- Read the sentence aloud as if explaining the idea to a friend who knows nothing about the topic. Mark every word you would not have said out loud.
- For each marked word, produce two other true phrases containing it, from memory, in under five seconds. Account for: "account for 40 per cent of exports", "account for the difference". If two come easily, you control the word.
- If you cannot produce two, you do not know the word's company and cannot predict it under pressure. Use the plain word instead.
- Spend the recovered effort on precision. Ask whether the plain word is the exact one: spending, funding or investment? Reduce, limit or ban? Salary or income? Those choices are what the descriptor calls precision.
The short form: if you would not use the word in speech to explain the idea, you probably cannot control it in writing. It is a heuristic, not a law: a word you have read many times in the right context passes step 2 even if you have never said it aloud. What it rejects is the word you met once, on a list, with a one-line gloss beside it.
What to do with the effort you just freed
Three habits move Lexical Resource more reliably than rare words.
Build topic collocations, not topic words. For each common Task 2 area, keep roughly fifteen phrases rather than fifty nouns: impose a ban, meet demand, narrow the gap, tighten regulations, bear the cost. They read as a sufficient range because they are fluent, and they cost nothing in accuracy.
Fix the word-formation errors you repeat. Economic and economical; effect and affect; advise and advice. Word formation is assessed under this criterion, and these are cheap, permanent marks.
Read model answers at your target band, not above it. A band 7 essay teaches more than a band 9 one: you can see which ordinary words do the precision work.
Progress here is slow, and honestly so: half a band is normally months of steady work rather than weeks — how long band 6 to band 7 takes puts real numbers on that — and the climb steepens above band 6. The effort has to go somewhere real. Learning to use account for correctly is real. Learning pecuniary is not.