meal vs buffet

meal and buffet both are nouns.

Word	Noun	Adjective	Verb	Adverb
meal	Yes	No	No	No
buffet	Yes	No	Yes	No

As nouns, buffet is a hyponym of meal; that is, buffet is a word with a more specific, narrower meaning than meal:

meal (noun)	buffet (noun)
the food served and eaten at one time	a piece of furniture that stands at the side of a dining room; has shelves and drawers
coarsely ground foodstuff; especially seeds of various cereal grasses or pulse	usually inexpensive bar
any of the occasions for eating food that occur by custom or habit at more or less fixed times	a meal set out on a buffet at which guests help themselves

meal (verb)	buffet (verb)
	strike against forcefully
	strike, beat repeatedly