scrubber vs purifier

scrubber and purifier both are nouns.

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

As nouns, purifier is a hypernym of scrubber; that is, purifier is a word with a broader meaning than scrubber:

scrubber (noun)	purifier (noun)
a purifier that removes impurities from a gas	an apparatus for removing impurities
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)