classify vs attribute

classify is not a noun while attribute is a noun.

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

As verbs, attribute is a hypernym of classify; that is, attribute is a word with a broader meaning than classify:

Other hypernyms of classify include assign.

classify (noun)	attribute (noun)
	an abstraction belonging to or characteristic of an entity
	a construct whereby objects or individuals can be distinguished

classify (verb)	attribute (verb)
arrange or order by classes or categories	attribute or credit to
assign to a class or kind	decide as to where something belongs in a scheme
declare unavailable, as for security reasons