buffet car vs carriage

buffet car and carriage both are nouns.

Word	Noun	Adjective	Verb	Adverb
buffet car	Yes	No	No	No
carriage	Yes	No	No	No

As nouns, carriage is a hypernym of buffet car; that is, carriage is a word with a broader meaning than buffet car:

Other hypernyms of buffet car include coach, passenger car.

buffet car (noun)	carriage (noun)
a passenger car where food is served in transit	a vehicle with wheels drawn by one or more horses
	a railcar where passengers ride
	a machine part that carries something else
	a small vehicle with four wheels in which a baby or child is pushed around
	characteristic way of bearing one's body