vestibule vs cavity

vestibule and cavity both are nouns.

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

As nouns, cavity is a hypernym of vestibule; that is, cavity is a word with a broader meaning than vestibule:

vestibule: any of various bodily cavities leading to another cavity (as of the ear or vagina)
cavity: (anatomy) a natural hollow or sinus within the body

Other hypernyms of vestibule include bodily cavity, cavum.

vestibule (noun)	cavity (noun)
a large entrance or reception room or area	(anatomy) a natural hollow or sinus within the body
any of various bodily cavities leading to another cavity (as of the ear or vagina)	a sizeable hole (usually in the ground)
	soft decayed area in a tooth; progressive decay can lead to the death of a tooth
	space that is surrounded by something