antechamber vs vestibule

antechamber and vestibule both are nouns.

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

As nouns, antechamber and vestibule are synonyms defined as:

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

antechamber (noun)	vestibule (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)