Noun instigator has 2 senses
  1. instigator, provoker, inciter, instigant, firebrand - someone who deliberately foments trouble; "she was the instigator of their quarrel"
    --1 is a kind of troublemaker, trouble maker, troubler, mischief-maker, bad hat
    --1 has particulars: ringleader
    Derived form: verb instigate1
  2. instigator, initiator - a person who initiates a course of action
    --2 is a kind of leader
    --2 has particulars: aggressor
    Derived form: verb instigate2
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