IELTS lexical resource: fancy words won't get you to band 7

Open the notebook of someone stuck at Writing 6.5 and you'll often find a word list: plethora, myriad, utilise, commence, ameliorate. All memorised, all slotted into every essay. The Lexical Resource score keeps coming back at 6, and the feedback never once says "use rarer words."

That picture is the whole problem. At 6.5, the instinct is to reach for a more impressive word. But the official Band Descriptors treat less common vocabulary used inaccurately as a Band 6 feature. The thesaurus that was supposed to lift your score may be the exact thing holding it down.

Lexical Resource (LR) is one of the four criteria used to mark IELTS Writing and Speaking, and it is the one that assesses your vocabulary. It is worth 25% of the score on each task. What it does not measure is how many words you know. This is a deep dive on that one criterion: what it actually rewards, why rarer words backfire, and the four things to work on instead, with examples you can copy.

What is lexical resource, and what does it measure?

Lexical Resource isn't a vocabulary-size test. The examiner isn't counting how many rare words you managed to fit in. The criterion looks at four things at once: the range of vocabulary you control, the precision with which you choose words, your collocation (whether words sit with their natural partners), and your accuracy in spelling and word formation.

Range matters, but it's the floor, not the ceiling. A wide vocabulary used carelessly scores below a smaller one used exactly.

LR is one of four equally weighted criteria in Writing, alongside Task Response, Coherence and Cohesion, and Grammatical Range and Accuracy. So it's worth a flat 25% of each Writing task's score. The same averaging that decides your overall score repeats one level down inside Writing.

Here's what the public Band Descriptors say at the boundary you care about. At Band 6, the resource is "generally adequate and appropriate for the task," and the descriptor has a line aimed straight at word-list users: "if the writer is a risk-taker, there will be a wider range of vocabulary used but higher degrees of inaccuracy or inappropriacy." At Band 7, the resource allows "some flexibility and precision," and "an awareness of style and collocation is evident." Read those side by side and the lever is obvious: 7 rewards accuracy and fit, not rarity.

The thesaurus trap

Put the two descriptors next to each other and a pattern jumps out. The very thing the Band 6 descriptor flags, the risk-taker's wider range with "higher degrees of inaccuracy or inappropriacy," is exactly what most 6.5 candidates do more of to try to escape 6.5.

Watch what over-reaching reads like:

Band 6, thesaurus-heavy: "A myriad of individuals utilise public transport to commence their daily commute, which ameliorates traffic congestion."

Every content word has been swapped for a rarer cousin. Nothing is misspelled, but "a myriad of individuals" and "commence" read as memorised, and "ameliorates" doesn't sit with "congestion" (you ease congestion, you don't ameliorate it). The examiner sees vocabulary worn like a borrowed suit.

Now the same idea in words the writer actually controls:

Band 7, precise: "When more people use public transport to get to work, road congestion eases."

Plainer words, exact fit. "Eases" is the natural partner for "congestion," and "get to work" says what "commence their daily commute" was straining to say. The second version scores higher because every word earns its place.

A rough self-check: highlight every word you'd call "advanced." For each one, ask whether a careful native writer would actually choose it here. If you're guessing on more than a couple, you're signalling Band 6, not climbing toward 7. The fix isn't a rarer word. It's the right one.

The four things LR actually rewards

Strip away the thesaurus habit and the criterion comes down to four levers. Most learners pour their effort into range, collecting more words, and neglect the other three. That's backwards, because precision and collocation are what separate 6 from 7.

Collocation: words travel in fixed company

English words keep regular company, and swapping a partner sounds wrong even when the meaning is clear. You "make a decision," you don't "do a decision." Rain is "heavy," not "strong." You "conduct research," never "make a research." These pairings aren't logical, they're just fixed, and a wrong partner is one of the clearest Band 6 markers, because the Band 7 descriptor names collocation directly.

The fix is to learn words in their pairs, verb plus noun and adjective plus noun, instead of as lonely dictionary entries. "Pollution" on its own does less for you than "tackle pollution," "reduce pollution," "air pollution." Store the company a word keeps, and precise vocabulary stops being a memory test.

Precision: the exact word beats the rare word

Precision means choosing the word that says exactly what you mean, not the most impressive one in reach. "A serious problem" is more precise than "a big problem." "Alleviate poverty" is sharper than "solve the poor problem." Neither fix needs a rare word: "serious" and "alleviate" are mid-frequency, the kind every Band 7 writer already owns.

This is why a smaller, well-aimed vocabulary outscores a showy one. The examiner is reading for whether you picked the word on purpose, or grabbed the first big one that came up.

Range, used where it fits

Range still counts. The descriptor wants enough resource for "some flexibility and precision," which means not repeating "important" six times when "significant," "pressing," and "central" each fit a different slot. The catch is the style half of "an awareness of style and collocation." Dropping an idiom like "at the end of the day" or "a piece of cake" into an academic essay clashes with the register, and a register clash reads as weak style, not rich vocabulary. Save the idioms for Speaking, where the descriptor actually rewards them.

Spelling and word formation: the quiet half-band

The least glamorous lever, and the easiest free points. Word formation is using the right form of a word: "economic growth," not "economical growth"; "the development of technology," not "the develop of technology." One word family, economy / economic / economical / economically, trips up thousands of candidates, because "economic" (to do with the economy) and "economical" (cheap) are not interchangeable. Band 7 allows only occasional slips here. A word-form or spelling error in every other sentence quietly keeps you at 6.

Common LR mistakes that quietly cost 0.5

A few patterns show up again and again in essays scoring 6 on LR. The thesaurus swap that breaks a collocation, already covered. The idiom in the wrong register, "kids" for "children," "a lot of" in a formal argument. The word-form error, where the right root takes the wrong ending. And the memorised showpiece phrase, "it is a double-edged sword," "every coin has two sides," bolted onto a point that didn't ask for it.

None of these come from not knowing enough words. That's the point. You can fix every one of them with the vocabulary you already have, which is why LR is often a cheaper half-band than it looks.

Build lexical resource in five minutes a day

A full practice essay spreads your attention across all four criteria, so LR rarely gets isolated work. You write a whole essay, get "Band 6, adequate vocabulary," and still can't tell whether your problem is collocation, precision, or word form. Targeted drills fix that:

• The collocation check. Take a paragraph you wrote and underline every verb-plus-noun and adjective-plus-noun pair. Look up the doubtful ones in a dictionary that shows collocations, then fix the partners that don't go together.
• The precision swap. Circle three vague words ("good," "big," "thing"). Replace each with the exact word for what you actually meant, not the rarest one you can find.
• The word-family drill. Take one key noun, say "pollution," and write its verb, adjective, and adverb forms. Use each in a sentence. Ten minutes spread over a week kills most word-form errors.

Five minutes, one lever, every day. If the vocabulary itself is thin, how to learn IELTS vocabulary lays out the pick, encode, and recall routine that feeds these drills. That's the idea behind IELTS Drills: feedback is tagged to a single Band Descriptor, so when your weak criterion is LR, you drill collocation and precision on their own instead of writing another full essay and hoping the vocabulary sorts itself out.

If you're not sure LR is the criterion holding you at 6.5 (it might be Task Response, Coherence and Cohesion, or grammar instead), the four-axis self-diagnosis here walks through all four so you target the right one. The restraint it asks for is the same one that coherence and cohesion rewards: fewer, better choices beat more.

Frequently asked questions

Is lexical resource just vocabulary? Not quite. It rewards range, but also precision, collocation, and accuracy in spelling and word formation. A big vocabulary used inaccurately still scores 6.

Do I need to memorise Band 7 and 8 word lists? No. A memorised "advanced" word used in the wrong place lowers LR, because the descriptor rewards "awareness of style and collocation," not rarity. Accurate use of mid-frequency words beats shaky use of rare ones.

How many less common words do I need per essay? There's no target number. The descriptor asks for appropriate use, not quantity. One precise less common word that fits beats five forced ones.

Does lexical resource apply to Speaking? Yes, it's a criterion in both. The Speaking version also rewards paraphrase and natural idiomatic language, which is judged differently from the more formal register of academic writing.

How much is lexical resource worth? A flat 25% of each Writing task's score. On each task the four criteria are weighted equally, and the task score is their average before it ever feeds into your overall band, where Task 2 counts for twice as much as Task 1.

The bottom line

Reaching for rarer words is the wrong instinct at 6.5, because less common vocabulary used inaccurately is what Band 6 looks like. Lexical Resource rewards something quieter: the right word over the rare word, partners that genuinely go together, and word forms you spell correctly. Get those right and the vocabulary you already have will carry you further than any thesaurus.

The test an examiner is applying is simple: does each word sound like a choice, or like a reach? Write for the first, and LR stops being the criterion that keeps costing you 0.5. With IELTS Drills, that's the kind of feedback you get back: tagged to LR, five minutes a day.