A homonym is also called a homophone and a homograph.
2. A word identical with another in spelling and pronunciation, but differing from it in origin and meaning: Two examples of homonyms which are spelled the same are butter, the food, and butter, one who butts.
3. The same name or word used to denote different things: The words bare, bear and bye, bye; buy, buy are examples of homonyms, as indicated in the cartoons below.