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the claim

The average adult vocabulary consists of 20,000 English words

the verdict

REFUTED

the evidence says no

confidence 10/100

Evidence from vocabulary studies indicates that the average adult vocabulary is significantly higher than 20,000 words, with a typical 20-year-old knowing approximately 42,000 lemmas.

Evidence against · 2

Wikipedia: Vocabulary

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Reference article covering this claim directly

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More against · 1

science.org: An average 20-year-old American knows 42,000 words, depending on how you count them | Science | AAAS

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Reports a study showing the average 20-year-old American knows about 42,000 lemmas, refuting 20,000.

The paper trail · every fact has a biography

first checked31 Jul 2026

judged → REFUTED · 1031 Jul 2026

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