cranial cavity vs cavity

cranial cavity and cavity both are nouns.

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

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

Other hypernyms of cranial cavity include bodily cavity, cavum.

cranial cavity (noun)	cavity (noun)
the cavity enclosed by the cranium	(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