What is the prefix for brush?

There isn't a common prefix for "brush". However, there are words that include "brush" as part of a compound word:

* Brushfire

* Brushstroke

* Brushwood

* Brushcutter

If you're looking for a word that means "like a brush," you could use bristly or hairy.

Could you tell me more about what you're trying to accomplish with the prefix? Maybe I can help you find a better word!