flag captain vs skipper

flag captain and skipper both are nouns.

Word	Noun	Adjective	Verb	Adverb
flag captain	Yes	No	No	No
skipper	Yes	No	Yes	No

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

Other hypernyms of flag captain include captain.

flag captain (noun)	skipper (noun)
the captain of a flagship	the naval officer in command of a military ship
	an officer who is licensed to command a merchant ship
	a student who fails to attend classes

flag captain (verb)	skipper (verb)
	work as the skipper on a vessel