pit vs cavity

pit and cavity both are nouns.

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

As nouns, pit and cavity are synonyms defined as:

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

Other hypernyms of pit include bodily cavity, cavum, concave shape, concavity, incurvation, incurvature.

pit (noun)	cavity (noun)
a surface excavation for extracting stone or slate	(anatomy) a natural hollow or sinus within the body
a workplace consisting of a coal mine plus all the buildings and equipment connected with it	a sizeable hole (usually in the ground)
a trap in the form of a concealed hole	soft decayed area in a tooth; progressive decay can lead to the death of a tooth
lowered area in front of a stage where an orchestra accompanies the performers	space that is surrounded by something
(auto racing) an area at the side of a racetrack where the race cars are serviced and refueled
(commodity exchange) the part of the floor of a commodity exchange where trading in a particular commodity is carried on
an enclosure in which animals are made to fight
(Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment
a sizeable hole (usually in the ground)
the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed
a concavity in a surface (especially an anatomical depression)

pit (verb)	cavity (verb)
remove the pits from
set into opposition or rivalry
mark with a scar