caries vs cavity

caries and cavity both are nouns.

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

As nouns, caries and cavity are synonyms defined as:

caries and cavity: soft decayed area in a tooth; progressive decay can lead to the death of a tooth

Other synonyms of caries include dental caries, tooth decay.

caries (noun)	cavity (noun)
soft decayed area in a tooth; progressive decay can lead to the death of a tooth	(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