liquidator vs hitman

liquidator and hitman both are nouns.

Word	Noun	Adjective	Verb	Adverb
liquidator	Yes	No	No	No
hitman	Yes	No	No	No

As nouns, hitman is a hyponym of liquidator; that is, hitman is a word with a more specific, narrower meaning than liquidator:

liquidator: a criminal who commits homicide (who performs the unlawful premeditated killing of another human being)
hitman: a professional killer who uses a gun

liquidator (noun)	hitman (noun)
(law) a person (usually appointed by a court of law) who liquidates assets or preserves them for the benefit of affected parties	a professional killer who uses a gun
a criminal who commits homicide (who performs the unlawful premeditated killing of another human being)