Definitions:

1. A person who harms others. NOUN
   • The court found him to be the victimizer in a series of financial scams, exploiting trust for personal gain.
2. Individuals or entities who exploit, manipulate, or mistreat people, causing physical, emotional, or psychological damage. NOUN
   • The victimizer is now claiming the mantle of the victim.
3. Someone who subjects others to harm, abuse, or injustice, making them victims. NOUN
   • I thought we were partners, not victim and victimizer.

Synonyms:

• assailant
• attacker
• blamer
• disturber
• molester
• troublemaker