Synonyms and related words :
agent provocateur, agitator, agitprop, catalyst, debater, declaimer, demagogue, exciter, firebrand, fomenter, haranguer, incendiary, inciter, inflamer, instigator, jawsmith, mischief-maker, panelist, provocateur, provoker, public speaker, ranter, ringleader, rouser, seditionary, seditionist, speaker, speecher, speechifier, speechmaker, spieler, spokesman, spokeswoman, spouter, talker, troublemaker, tub-thumper, urger