triggerman vs gunslinger

triggerman and gunslinger both are nouns.

Word	Noun	Adjective	Verb	Adverb
triggerman	Yes	No	No	No
gunslinger	Yes	No	No	No

As nouns, triggerman and gunslinger are synonyms defined as:

Other synonyms of triggerman include gun, gun for hire, gunman, hired gun, hit man, hitman, shooter, torpedo.

triggerman (noun)	gunslinger (noun)
a professional killer who uses a gun	a professional killer who uses a gun