vestibule vs cavum

vestibule and cavum both are nouns.

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

As nouns, cavum is a hypernym of vestibule; that is, cavum 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)
cavum: (anatomy) a natural hollow or sinus within the body

Other hypernyms of vestibule include bodily cavity, cavity.

vestibule (noun)	cavum (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)