vestibule vs anteroom

vestibule and anteroom both are nouns.

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

As nouns, vestibule and anteroom are synonyms defined as:

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

vestibule (noun)	anteroom (noun)
a large entrance or reception room or area	a large entrance or reception room or area
any of various bodily cavities leading to another cavity (as of the ear or vagina)