This is a quick and easy way to check how many English words you know.
(http://testyourvocab.com)
● Most adult native test-takers range from 20,000–35,000 words
● Average native test-takers of age 8 already know 10,000 words
● Average native test-takers of age 4 already know 5,000 words
● Adult native test-takers learn almost 1 new word a day until middle age
● Adult test-taker vocabulary growth basically stops at middle age
● The most common vocabulary size for foreign test-takers is 4,500 words
● Foreign test-takers tend to reach over 10,000 words by living abroad
● Foreign test-takers learn 2.5 new words a day while living in an English-speaking country