collaborator vs partner in crime

collaborator and partner in crime both are nouns.

Word	Noun	Adjective	Verb	Adverb
collaborator	Yes	No	No	No
partner in crime	Yes	No	No	No

As nouns, collaborator and partner in crime are synonyms defined as:

Other synonyms of collaborator include confederate, henchman.

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