Synonyms and related words :
agitator, anarch, anarchist, belittler, bellyacher, brawler, captious critic, carper, caviler, censor, censurer, common scold, complainant, complainer, crab, crank, critic, criticizer, croaker, extremist, faultfinder, griper, grouch, grouser, growler, grumbler, insubordinate, insurgent, insurrectionary, insurrectionist, insurrecto, kicker, kvetch, malcontent, maverick, momus, murmurer, mutineer, mutterer, nitpicker, nonconformist, pettifogger, querulous person, quibbler, reactionary, reactionist, rebel, revolter, revolutionary, revolutionist, rioter, scold, smellfungus, sorehead, subversive, traitor, whiner