scrub brush vs scrubbing brush

scrub brush and scrubbing brush both are nouns.

Word	Noun	Adjective	Verb	Adverb
scrub brush	Yes	No	No	No
scrubbing brush	Yes	No	No	No

As nouns, scrub brush and scrubbing brush are synonyms defined as:

scrub brush and scrubbing brush: a brush with short stiff bristles for heavy cleaning

Other synonyms of scrub brush include scrubber.

scrub brush (noun)	scrubbing brush (noun)
a brush with short stiff bristles for heavy cleaning	a brush with short stiff bristles for heavy cleaning