oral fissure vs maw

oral fissure and maw both are nouns.

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

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

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

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