united vs collective

united is not a noun while collective is a noun.

Word	Noun	Adjective	Verb	Adverb
united	No	Yes	No	No
collective	Yes	Yes	No	No

united (noun)	collective (noun)
	members of a cooperative enterprise

united (adjective)	collective (adjective)
characterized by unity; being or joined into a single entity	forming a whole or aggregate
of or relating to two people who are married to each other	done by or characteristic of individuals acting together
involving the joint activity of two or more	set up on the principle of collectivism or ownership and production by the workers involved usually under the supervision of a government