Joke

Another version is:
Think of words ending in 'gry'.
Angry and hungry are two of them.
There are only three words in the English language.
What is the third word?
The word is something that everyone uses every day.
If you have listened carefully, I have already told you what it is.

In this case the real question is: "There are only three words in the English language. What is the third word?" That is, there are only three words in the phrase "the English language". The third word is "language", which is indeed something we use every day. The first two words are "the" and "English".