ventricle vs bodily cavity

ventricle and bodily cavity both are nouns.

Word	Noun	Adjective	Verb	Adverb
ventricle	Yes	No	No	No
bodily cavity	Yes	No	No	No

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

ventricle: one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid
bodily cavity: (anatomy) a natural hollow or sinus within the body

Other hypernyms of ventricle include cavity, cavum.

ventricle (noun)	bodily cavity (noun)
a chamber of the heart that receives blood from an atrium and pumps it to the arteries	(anatomy) a natural hollow or sinus within the body
one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid