Cunt

A womens vagina and the worst insult there is.

I'm gonna stick my cock in your little cunt!

Terry, your such a cunt

Cuck

Cuck is short for cock held.
This is a man who is in a domanate realashonship with with a women.

Man 1:Hey do you know steve?
Man 2: what the cuck?
Man 1: yeah him