compare vs classify

compare is a noun but classify is not a noun.

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

compare (noun)	classify (noun)
qualities that are comparable

compare (verb)	classify (verb)
examine and note the similarities or differences of	arrange or order by classes or categories
consider or describe as similar, equal, or analogous	assign to a class or kind
to form the comparative or superlative form on an adjective or adverb	declare unavailable, as for security reasons
be comparable