chieftain vs captain

chieftain and captain both are nouns.

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

As nouns, chieftain and captain are synonyms defined as:

chieftain (noun)	captain (noun)
the head of a tribe or clan	a dining-room attendant who is in charge of the waiters and the seating of customers
the leader of a group of people	the pilot in charge of an airship
	the naval officer in command of a military ship
	an officer who is licensed to command a merchant ship
	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

chieftain (verb)	captain (verb)
	be the captain of a sports team