Interesting little test...
Quote:
TestYourVocab.com is part of an American-Brazilian research project to measure vocabulary sizes according to age and education, and particularly to compare native learning rates with foreign language classroom learning rates.
It functions by means of a quick three-part test: the first part with a handful of words to determine the general vocabulary level, a second part with a larger but narrower selection of words to determine the vocabulary level with greater precision, and a final (optional) survey to collect statistical information.
Based on over 200,000 participations so far, we've got some initial statistics already. Most Native English adult speakers who have taken the test fall in the range 20,000–35,000 words. Click here for a full breakdown by age (opens in new tab/window).
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http://testyourvocab.com/
My results.....
Your total vocabulary size is estimated to be: 21,500 words