Synonyms for Slit (same or very similar meaning)
WordNet sense 1 (a depression scratched or carved into a surface):
dent, incision, prick, scratchWordNet sense 2 (obscene terms for female genitals):
cunt, puss, pussy, snatch, pussyWordNet sense 3 (make a clean cut through):
sliceFrom the ODE community, based on WordNetadd/edit