cooperator vs collaborator

cooperator and collaborator both are nouns.

Word	Noun	Adjective	Verb	Adverb
cooperator	Yes	No	No	No
collaborator	Yes	No	No	No

As nouns, cooperator and collaborator are synonyms defined as:

cooperator and collaborator: an associate in an activity or endeavor or sphere of common interest

Other synonyms of cooperator include pardner, partner.

cooperator (noun)	collaborator (noun)
an associate in an activity or endeavor or sphere of common interest	an associate in an activity or endeavor or sphere of common interest
	someone who collaborates with an enemy occupying force
	someone who assists in a plot