If my suggestions are not carried out properly then I have to agree with the answer already given, till her, pill her, Prison?
Kill them, Fill them
Another word for snitch that rhymes with "kill" could be "chill."
uphill, will, kill, chill
Spapple.
gelatis, Maseratis
Since I have to assume you have tried will you? and that did not work then why are you looking for something to rhyme with kill you?
Em. (Short for Emily) Jem, such as the boy from "To Kill A Mockingbird."
Thrill! mill bill kill shrill frill
Slaughter (as in kill, like killing an animal)
pill, chill, kill, trill, phil, will, nil, quill.
You kill, pill, fill, windmill, Jill, krill, dill, chill.
Yes, both have the "ih" sound of the short I. Fish rhymes with dish and wish. Pill rhymes with bill, fill, and kill.