buffet car vs coach

buffet car and coach both are nouns.

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

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

Other hypernyms of buffet car include carriage, passenger car.

buffet car (noun)	coach (noun)
a passenger car where food is served in transit	a carriage pulled by four horses with one driver
	a railcar where passengers ride
	a vehicle carrying many passengers; used for public transport
	a person who gives private instruction (as in singing, acting, etc.)
	(sports) someone in charge of training an athlete or a team

buffet car (verb)	coach (verb)
	teach and supervise (someone); act as a trainer or coach (to), as in sports
	drive or operate a coach or carriage