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