restaurant vs building

restaurant and building both are nouns.

Word	Noun	Adjective	Verb	Adverb
restaurant	Yes	No	No	No
building	Yes	No	No	No

As nouns, building is a hypernym of restaurant; that is, building is a word with a broader meaning than restaurant:

restaurant: a building where people go to eat
building: a structure that has a roof and walls and stands more or less permanently in one place

Other hypernyms of restaurant include edifice.

restaurant (noun)	building (noun)
a building where people go to eat	the act of constructing something
	the commercial activity involved in repairing old structures or constructing new ones
	a structure that has a roof and walls and stands more or less permanently in one place
	the occupants of a building