attribute vs classify

attribute is a noun but classify is not a noun.

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

As verbs, classify is a hyponym of attribute; that is, classify is a word with a more specific, narrower meaning than attribute:

Other hyponyms of attribute include relegate.

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

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