purifier vs scrubber

purifier and scrubber both are nouns.

Word	Noun	Adjective	Verb	Adverb
purifier	Yes	No	No	No
scrubber	Yes	No	No	No

As nouns, scrubber is a hyponym of purifier; that is, scrubber is a word with a more specific, narrower meaning than purifier:

purifier (noun)	scrubber (noun)
an apparatus for removing impurities	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)