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Noun: instigator  'in-stu,gey-tu(r)
  1. Someone who deliberately foments trouble
    "she was the instigator of their quarrel";
    - provoker, inciter, instigant, firebrand
     
  2. A person who initiates a course of action
    - initiator

Derived forms: instigators

Type of: bad hat, leader, mischief-maker, trouble maker, troublemaker, troubler

Encyclopedia: Instigator