skipper vs ship's officer

skipper and ship's officer both are nouns.

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

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

skipper: an officer who is licensed to command a merchant ship
ship's officer: a person authorized to serve in a position of authority on a vessel

Other hypernyms of skipper include officer.

skipper (noun)	ship's officer (noun)
the naval officer in command of a military ship	a person authorized to serve in a position of authority on a vessel
an officer who is licensed to command a merchant ship
a student who fails to attend classes

skipper (verb)	ship's officer (verb)
work as the skipper on a vessel