I was chatting with a friend and we were talking about our command of the English language, in particular the size of our vocabulary. This made me very curious as to how many words I know. I obviously can't count it, and so I did a search and found this website: http://testyourvocab.com.
It is a very interesting site. All you need to do is to pick out words you know the definition of, and it will give you an estimate size of your vocabulary.
According to the test, it seems I know about 25,500 words and that is equivalent to being a native speaker. I know I am not technically a native speaker, but I still regard English as my first language.
How many words do you know?