classify vs classifier

classify is not a noun while classifier is a noun.

Word	Noun	Adjective	Verb	Adverb
classify	No	No	Yes	No
classifier	Yes	No	No	No

classify (noun)	classifier (noun)
	an algorithm that implements classification.
	a word or morpheme used in some languages in certain contexts (such as counting) to indicate the semantic class to which the counted item belongs
	a person who creates classifications

classify (verb)	classifier (verb)
arrange or order by classes or categories
assign to a class or kind
declare unavailable, as for security reasons