1) Cheater 
• (n.) One who cheats or defrauds.
Coz'en·er noun One who cheats or defrauds. 
cozener 1. Someone who to cheats, deceives, or tricks. 2. Anyone who acts with artful deceit; a cheat, an impostor. 3. A person who misleads by means of a petty trick or fraud; a deceiver.