13
firebrand(noun, phony, radical, operative, motive)
12
agitator(noun, calm, person, change, radical)
12
inciter(noun, calm, person, change, radical)
10
provoker
9
driving force
7
fomenter(noun, calm, person, change, radical)
7
initiator
6
incendiary(noun, phony, radical, operative, motive)
6
demagogue(noun, person, radical, partisan, reactionary)
6
agent provocateur(noun, expression, idiom, agent, motive)
5
rabble-rouser(noun, phony, radical, operative, reactionary)
5
troublemaker(noun, person, radical, operative, reactionary)
4
exciter
4
instigant
4
mover(noun, cause, radical, partisan, reactionary)
4
ringleader(noun, leader, radical, operative, partisan)
3
creator(noun, cause, mover, inventor)
3
provocateur(noun, radical, operative, partisan, reactionary)
3
rouser
3
catalyst
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APASmart Define. (2015). instigator thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/instigator/thesaurus/synonyms
ChicagoSmart Define. 2015. "instigator thesaurus" https://smartdefine.org/instigator/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, instigator thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/instigator/thesaurus/synonyms>.
MLASmart Define. "instigator thesaurus" 16 November 2015. Web. 21 September 2026. <https://smartdefine.org/instigator/thesaurus/synonyms>