categorise vs compare

categorise is not a noun while compare is a noun.

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

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

categorise (verb)	compare (verb)
place into or assign to a category	examine and note the similarities or differences of
	consider or describe as similar, equal, or analogous
	to form the comparative or superlative form on an adjective or adverb
	be comparable