liquidator vs hired gun

liquidator and hired gun both are nouns.

Word	Noun	Adjective	Verb	Adverb
liquidator	Yes	No	No	No
hired gun	Yes	No	No	No

As nouns, hired gun is a hyponym of liquidator; that is, hired gun 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)
hired gun: a professional killer who uses a gun

liquidator (noun)	hired gun (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)