privateer vs ship's officer

privateer and ship's officer both are nouns.

Word	Noun	Adjective	Verb	Adverb
privateer	Yes	No	No	No
ship's officer	Yes	No	No	No

As nouns, ship's officer is a hypernym of privateer; that is, ship's officer is a word with a broader meaning than privateer:

privateer: an officer or crew member of a privateer
ship's officer: a person authorized to serve in a position of authority on a vessel

Other hypernyms of privateer include crew member, crewman, officer.

privateer (noun)	ship's officer (noun)
a privately owned warship commissioned to prey on the commercial shipping or warships of an enemy nation	a person authorized to serve in a position of authority on a vessel
an officer or crew member of a privateer