yap vs oral cavity

yap and oral cavity both are nouns.

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

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

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

Other hypernyms of yap include mouth, oral fissure, rima oris.

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

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