crevice vs slit

crevice and slit both are nouns.

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

As nouns, slit is a hyponym of crevice; that is, slit is a word with a more specific, narrower meaning than crevice:

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

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