axillary fossa vs cavity

axillary fossa and cavity both are nouns.

Word	Noun	Adjective	Verb	Adverb
axillary fossa	Yes	No	No	No
cavity	Yes	No	No	No

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

Other hypernyms of axillary fossa include bodily cavity, cavum.

axillary fossa (noun)	cavity (noun)
the hollow under the arm where it is joined to the shoulder	(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