From The Collaborative International Dictionary of English v.0.44 [gcide]:
Demagogue \Dem"a*gogue\ (?; 115), noun [Gr. dhmagwgo's a popular leader; commonly in a bad sense, a leader of the mob; dh^mos the people + 'agwgo's leading, fr. 'a'gein to lead; akin to E. act: cf. F. d['e]magogue.] A leader of the rabble; one who attempts to control the multitude by specious or deceitful arts; an unprincipled and factious mob orator or political leader.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
56 Moby Thesaurus words for "demagogue": agent provocateur, agitator, agitprop, catalyst, debate, debater, declaim, declaimer, elocute, exciter, firebrand, fomenter, harangue, haranguer, hold forth, hothead, incendiary, inciter, inflamer, instigator, jawsmith, mischief-maker, mouth, orate, out-herod Herod, panelist, perorate, provocateur, provoker, public speaker, rabble-rouse, rabble-rouser, rant, ranter, read, recite, ringleader, rodomontade, rouser, seditionary, seditionist, speaker, speecher, speechifier, speechmaker, spiel, spieler, spokesman, spokeswoman, spout, spouter, talker, troublemaker, tub-thump, tub-thumper, urger
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