cooperative vs helpful

cooperative is a noun but helpful is not a noun.

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

cooperative (noun)	helpful (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

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