oral fissure vs hole

oral fissure and hole both are nouns.

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

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

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

oral fissure (noun)	hole (noun)
the opening through which food is taken in and vocalizations emerge	an opening deliberately made in or through something
	one playing period (from tee to green) on a golf course
	informal terms for the mouth
	an opening into or through something
	a depression hollowed out of solid matter
	an unoccupied space
	informal terms for a difficult situation
	a fault

oral fissure (verb)	hole (verb)
	make holes in
	hit the ball into the hole