eating house vs restaurant

eating house and restaurant both are nouns.

Word	Noun	Adjective	Verb	Adverb
eating house	Yes	No	No	No
restaurant	Yes	No	No	No

As nouns, eating house and restaurant are synonyms defined as:

Other synonyms of eating house include eatery, eating place.

eating house (noun)	restaurant (noun)
a building where people go to eat	a building where people go to eat