oral cavity vs gob

oral cavity and gob both are nouns.

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

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

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

oral cavity (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