1) Flogger 2) Torturer 1) Flogger 
• (n.) One who scourges or punishes; one who afflicts severely.
Scour'ger noun One who scourges or punishes; one who afflicts severely. « The West must own the scourger of the world.» Byron. 
scourger 1. A torturer who flogs or scourges (especially an official whose duty is to whip offenders). 2. Someone, or something, that causes great suffering or a lot of trouble.