frondeur

synonyms

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