Lexical resource: precision over "big words"

Lexical Resource measures the range, precision and naturalness of your vocabulary, including collocation. The most common and most expensive misunderstanding is that long, rare words raise your band. They don't - a misused "big word" is penalised as an error, while a precise, well-collocated everyday word is rewarded. The band-8 descriptor talks about using "uncommon lexical items… with only occasional inaccuracies in word choice"; the route there is the right word, used naturally, not the rarest word you can find.

What actually scores

• Collocation - words that naturally go together: make progress, a heavy burden, widely regarded, pose a threat.
• Precision - the exact word for the meaning: decline vs plummet vs dip.
• Topic vocabulary - tuition fees, carbon emissions, urban sprawl used correctly.
• Paraphrasing - re-expressing the prompt's words without changing the meaning.

Worked example 1 - before / after

Before (forced rare words, wrong collocation):

Nowadays, the utilisation of automobiles engenders a plethora of catastrophic predicaments for the ecosystem.

This is over-written and the collocations are wrong (engender predicaments is not English) - examiners read it as straining, not strong, and mark the misfires as errors.

After (precise, natural, well-collocated):

The growing use of private cars poses a serious threat to the environment, particularly through air pollution.

Why this scores: poses a threat and a serious threat are natural collocations; growing use is precise; particularly through narrows the claim accurately. It reads like a confident user of English - exactly what band 7+ describes - and not one word is wasted on display.

Worked example 2 - precision and the right verb of degree

The same idea can be expressed at very different levels of precision. Watch the verb do the work:

Vague (band 5-6): A lot of fish in the sea have become less because of fishing.

Precise (band 7-8): Fish stocks have declined sharply as a result of overfishing, and some species are now on the brink of collapse.

Why this scores: fish stocks (the exact term), declined sharply (a verb of degree + adverb), overfishing (a single precise topic word replacing "a lot of fishing"), and the idiom on the brink of collapse together demonstrate range and accuracy. Crucially, each item is the natural choice a fluent writer would reach for - nothing is forced.

Worked example 3 - synonyms are not interchangeable

A thesaurus lists "synonyms", but in English the shade of meaning and the typical context differ. Big, large, vast, substantial and hefty are not swappable at will:

✅ a substantial increase · a vast desert · a large proportion · a hefty fine

❌ a hefty desert · a vast fine · a hefty proportion

The point for Lexical Resource is that range means knowing which near-synonym fits where, not owning the longest list. A substantial increase in tuition fees scores; a hefty increase in tuition fees sounds informal and slightly off; a voluminous increase is simply wrong. When you meet a new "fancy" word, learn the two or three nouns it actually pairs with before you ever use it.

Paraphrasing without distortion

Prompt: Many people believe technology has made us less social.

✅ It is widely argued that digital devices have weakened face-to-face interaction.

❌ A myriad of individuals conjecture that gadgets diminish our sociability. (unnatural)

Change structure and word class, not just swap in a thesaurus synonym. The good version recasts many people believe as the passive it is widely argued and less social as weakened face-to-face interaction - a structural change, not a word-swap. A safe routine: keep the key topic noun (here, broadly, technology / digital devices) and change the verb and the framing around it. Over-paraphrasing the topic word itself is where meaning gets lost and accuracy marks disappear.

Build collocation, not word lists

Learn words in chunks: not "environment" alone, but protect the environment, environmental damage, environmentally friendly. Chunks are what make writing sound natural, because native usage is collocation.

High-value academic collocations to bank: play a vital role · have a profound impact on · pose a significant threat · place a strain on · strike a balance between · address / tackle an issue · widely regarded as · a growing body of evidence · raise awareness of.

Common mistakes

• Thesaurus abuse - swapping a simple word for a rare one that doesn't fit (good → propitious).
• Wrong collocation - do a mistake, make a research, strong rain, say a lie.
• Repeating the same word when a precise synonym exists (good… good… good).
• Memorised phrases dropped in regardless of whether they fit the topic.
• Spelling and word-form slips (economy / economic / economical confused).

Try it

At **/ielts/writing*, write one body paragraph, then underline every noun. For each, ask: what verb or adjective naturally goes with this? Replace any awkward pairing with a real collocation (a problem → tackle a problem; pollution → reduce pollution; a role → play a role*). Natural pairings lift this score faster than any rare word ever will.