slit vs crevice

slit and crevice both are nouns.

Word	Noun	Adjective	Verb	Adverb
slit	Yes	No	Yes	No
crevice	Yes	No	No	No

As nouns, crevice is a hypernym of slit; that is, crevice is a word with a broader meaning than slit:

Other hypernyms of slit include cleft, crack, fissure, scissure.

slit (noun)	crevice (noun)
a long narrow opening	a long narrow cleft
obscene terms for female genitals	a long narrow depression in a surface
a narrow fissure
a depression scratched or carved into a surface

slit (verb)	crevice (verb)
cut a slit into
make a clean cut through