oral cavity vs yap

oral cavity and yap both are nouns.

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

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

oral cavity: the opening through which food is taken in and vocalizations emerge
yap: informal terms for the mouth

Other hyponyms of oral cavity include cakehole, gob, hole, maw, trap.

oral cavity (noun)	yap (noun)
the opening through which food is taken in and vocalizations emerge	informal terms for the mouth

oral cavity (verb)	yap (verb)
	bark in a high-pitched tone