helpful vs cooperative

helpful is not a noun while cooperative is a noun.

Word	Noun	Adjective	Verb	Adverb
helpful	No	Yes	No	No
cooperative	Yes	Yes	No	No

helpful (noun)	cooperative (noun)
	a jointly owned commercial enterprise (usually organized by farmers or consumers) that produces and distributes goods and services and is run for the benefit of its owners
	an association formed and operated for the benefit of those using it

helpful (adjective)	cooperative (adjective)
providing assistance or serving a useful function	done with or working with others for a common purpose or benefit
	involving the joint activity of two or more
	willing to adjust to differences in order to obtain agreement