scrub brush vs scrubber

scrub brush and scrubber both are nouns.

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

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

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

Other synonyms of scrub brush include scrubbing brush.

scrub brush (noun)	scrubber (noun)
a brush with short stiff bristles for heavy cleaning	a purifier that removes impurities from a gas
	a brush with short stiff bristles for heavy cleaning
	a worker who uses a scrub brush to clean a surface (usually a floor or deck)