captain vs officer

captain and officer both are nouns.

Word	Noun	Adjective	Verb	Adverb
captain	Yes	No	Yes	No
officer	Yes	No	Yes	No

As nouns, officer is a hypernym of captain; that is, officer is a word with a broader meaning than captain:

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

Other hypernyms of captain include ship's officer.

As nouns, officer is a hypernym of captain; that is, officer is a word with a broader meaning than captain:

Other hypernyms of captain include police officer.

captain (noun)	officer (noun)
a dining-room attendant who is in charge of the waiters and the seating of customers	a member of a police force
the pilot in charge of an airship	someone who is appointed or elected to an office and who holds a position of trust
the naval officer in command of a military ship	any person in the armed services who holds a position of authority or command
an officer who is licensed to command a merchant ship	a person authorized to serve in a position of authority on a vessel
a policeman in charge of a precinct
an officer holding a rank below a major but above a lieutenant
the leader of a group of people

captain (verb)	officer (verb)
be the captain of a sports team	direct or command as an officer