female genitals vs slit

female genitals and slit both are nouns.

Word	Noun	Adjective	Verb	Adverb
female genitals	Yes	No	No	No
slit	Yes	No	Yes	No

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

Other hyponyms of female genitals include minge, cunt, puss, pussy, snatch, twat, vulva.

female genitals (noun)	slit (noun)
external female sex organs	a long narrow opening
	obscene terms for female genitals
	a narrow fissure
	a depression scratched or carved into a surface

female genitals (verb)	slit (verb)
	cut a slit into
	make a clean cut through