foyer vs anteroom

foyer and anteroom both are nouns.

Word	Noun	Adjective	Verb	Adverb
foyer	Yes	No	No	No
anteroom	Yes	No	No	No

As nouns, foyer and anteroom are synonyms defined as:

Other synonyms of foyer include antechamber, entrance hall, hall, lobby, vestibule.

foyer (noun)	anteroom (noun)
a large entrance or reception room or area	a large entrance or reception room or area