rima oris vs yap

rima oris and yap both are nouns.

Word	Noun	Adjective	Verb	Adverb
rima oris	Yes	No	No	No
yap	Yes	No	Yes	No

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

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

Other hyponyms of rima oris include cakehole, gob, hole, maw, trap.

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

rima oris (verb)	yap (verb)
	bark in a high-pitched tone