maw vs oral fissure

maw and oral fissure both are nouns.

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

As nouns, oral fissure is a hypernym of maw; that is, oral fissure is a word with a broader meaning than maw:

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

Other hypernyms of maw include mouth, oral cavity, rima oris.

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