rima oris vs gob

rima oris and gob both are nouns.

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

As nouns, gob is a hyponym of rima oris; that is, gob 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
gob: informal terms for the mouth

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

rima oris (noun)	gob (noun)
the opening through which food is taken in and vocalizations emerge	informal terms for the mouth
	a lump of slimy stuff
	a man who serves as a sailor