quisling vs collaborator

quisling and collaborator both are nouns.

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

As nouns, quisling and collaborator are synonyms defined as:

quisling and collaborator: someone who collaborates with an enemy occupying force

Other synonyms of quisling include collaborationist.

quisling (noun)	collaborator (noun)
someone who collaborates with an enemy occupying force	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