It's a bit of a trick question! Homonyms are words that sound the same but have different meanings and spellings. In this case, "back" has several different meanings, but they are all spelled the same way.
Here are a few examples:
* Go back: to return to a previous place.
* Back of the book: the rear section.
* Back pain: pain in the back of the body.
* Back someone up: to support them.
Let me know if you'd like to explore other homonyms! 😊