The term "revolutioner" refers to a person who initiates or leads a revolution. Synonyms for this word include "rebel," "insurgent," "agitator," "instigator," "firebrand," "radical," and "reformer." A rebel is someone who opposes the established authority and fights against it. An insurgent is someone who rises up against the ruling power, often in armed conflict. An agitator is someone who promotes discontent and unrest, typically through speech or writing. An instigator is someone who provokes or incites others to take action. A firebrand is someone who is passionate about a particular issue or cause and is willing to take extreme actions. A radical is someone who advocates for extreme and fundamental change. And a reformer is someone who seeks to improve a system or institution from within.