What is a homonym for sharp knock?

There isn't a perfect homonym for "sharp knock" because it's a two-word phrase. However, here are some options depending on the context:

If focusing on the sound:

* Sharp could be replaced with stark, although it wouldn't be an exact synonym.

* Knock could be replaced with rap, but this would change the meaning slightly, implying a quicker, less forceful sound.

If focusing on the action:

* Sharp could be replaced with sudden, but again, it's not an exact synonym.

* Knock could be replaced with rap, but this implies a more gentle, less forceful action.

It's important to consider the context and the intended meaning to choose the best word or phrase.

For example, if you're describing a loud, forceful sound, "sharp knock" would be the most accurate. If you're describing a sudden, unexpected sound, "stark rap" might be more appropriate.