Nouns

(n)pit, cavitya sizeable hole (usually in the ground)“they dug a pit to bury the body”
(n)cavity, enclosed spacespace that is surrounded by something
(n)cavity, caries, dental caries, tooth decaysoft decayed area in a tooth; progressive decay can lead to the death of a tooth
(n)cavity, bodily cavity, cavum(anatomy) a natural hollow or sinus within the body