cavity vs sandpit

cavity and sandpit both are nouns.

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

As nouns, sandpit is a hyponym of cavity; that is, sandpit is a word with a more specific, narrower meaning than cavity:

Other hyponyms of cavity include trou-de-loup, barbecue pit, borrow pit, divot, fire pit, quicksand, sawpit, tar pit.

cavity (noun)	sandpit (noun)
(anatomy) a natural hollow or sinus within the body	a plaything consisting of a pile of sand or a box filled with sand for children to play in
a sizeable hole (usually in the ground)	a large pit in sandy ground from which sand is dug
soft decayed area in a tooth; progressive decay can lead to the death of a tooth
space that is surrounded by something