henchman vs collaborator

henchman and collaborator both are nouns.

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

As nouns, henchman and collaborator are synonyms defined as:

Other synonyms of henchman include confederate, partner in crime.

henchman (noun)	collaborator (noun)
someone who assists in a plot	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