cavum vs cavity

cavum and cavity both are nouns.

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

As nouns, cavum and cavity are synonyms defined as:

Other synonyms of cavum include bodily cavity.

cavum (noun)	cavity (noun)
(anatomy) a natural hollow or sinus within the body	(anatomy) a natural hollow or sinus within the body
	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