oral cavity vs rima

oral cavity and rima both are nouns.

Word	Noun	Adjective	Verb	Adverb
oral cavity	Yes	No	No	No
rima	Yes	No	No	No

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

oral cavity: the opening through which food is taken in and vocalizations emerge
rima: a narrow elongated opening or fissure between two symmetrical parts

oral cavity (noun)	rima (noun)
the opening through which food is taken in and vocalizations emerge	a narrow elongated opening or fissure between two symmetrical parts