oral fissure vs gob

oral fissure and gob both are nouns.

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

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

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

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

oral fissure (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