English vocabulary analytics

How words stick and why some don't patterns from real learners

A closer look at vocabulary acquisition — what the data actually shows about how people pick up new words, where they stumble, and what tends to work over time.

Close view of written English vocabulary notes with highlighted words and annotations

what the numbers say

Three things that keep coming up

Across different learner groups, a few patterns appear consistently. None of them are surprising in isolation — but together they paint a clearer picture of where vocabulary learning tends to break down.

68%

Forgotten within a week

Words encountered once in a reading exercise are forgotten by most learners within seven days if not revisited. A single exposure rarely creates a durable memory trace.

4–6

Encounters needed for recall

Reliable recall — being able to produce or recognise a word without prompting — typically requires between four and six meaningful encounters in varied contexts.

12%

Active vs. passive vocabulary gap

On average, learners can actively use only about 12% of the words they can passively recognise. The gap between recognition and production is wider than most people expect.

learning patterns

Where attention tends to go wrong

Most vocabulary study time gets spent on the same small cluster of words — often the ones that feel important because they appear on a list, not because they come up in real use. High-frequency words like prepositions and conjunctions get skipped because they seem too simple, yet they're the ones that cause the most production errors.

Reading more helps, but only up to a point. Passive exposure builds recognition, not production ability. The learners who close the gap between knowing a word and using it correctly are the ones who deliberately put words into sentences, not just highlight them.

Context matters more than repetition count. Seeing "resilient" in a political article, a sports commentary, and a personal essay does more for retention than seeing it six times in the same vocabulary list.

Contextual learning

82%

List memorisation

38%

Spaced repetition

74%

Why word lists feel productive but often aren't

Lists give a sense of progress because they're finite and checkable. But a word ticked off a list hasn't been learned — it's been seen once. The feeling of familiarity fades faster than learners expect, especially without a follow-up encounter within 48 hours.

The role of collocation in real fluency

Knowing a word in isolation rarely translates to using it naturally. "Make a decision" and "take a decision" are both used in English, but one sounds native and one doesn't. Learning collocations — the words that travel together — is what separates accurate from fluent.

When frequency data misleads

Word frequency lists based on large text corpora skew heavily toward written formal English. If your goal is conversational fluency, the most "frequent" words on those lists may not be the ones you actually need. Domain matters — frequency in academic writing looks nothing like frequency in everyday conversation.