collective vs united

collective is a noun but united is not a noun.

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

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

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