How Many Words Do You Know?
The second edition of the Oxford English Dictionary has more than entries, only a very small fraction of which are used every day. Use this Demonstration to test your proficiency in the English language. However, to get a valid statistical estimate, you must try at least 450 or 500 words.
The game can be played using a maximum of 1000 words. Each time you know the meaning of a word, click the "I know it" button. Use the "confirm" button to check the meaning of the word. If you do not know a word, click "I don't" and then click "define" to learn its meaning.
Choose how many words to play with and the game will automatically finish when you reach that number. Click "end game" any time you want to quit. Select "result" at the end of a game to see how well you did.