naysayer, supporter, hater, proponent, critic, skeptic, apologist, admirer, basher, votary, gadfly, opposer, backer, dissenter, sympathizer, devotee, complainer, acolyte, whiner, whipping boy, agitator, bete noire, advocate, contributor, adversary, zealot, hypocrite, taxer, baiter, practicer, homophobe, laggard, meddler, crusader, nemesis, exponent, ideologue, ditherer, testifier, environmentalist, instigator, observer, culprit, hugger, antagonist, detraction, sulker, antisemite, moaner, follower, micromanager, stalwart, believer, criticisms, misgiving, controversialist, provocateur, grumbler, backslider, dabbler, cynic, troublemaker, griper, dissembler, doubter, beneficiary, disciple, wimp, nitpicker, intimidator, disbeliever, blogger, retort, panderer, betrayer, motivator, penny pincher, irritant, doomsayer, loose cannon, naderite, questioner, thorn, shill, activist, crybaby, ranter, contrarian, twitterer, fearmonger, needler, proselytizer, cheerleader, competitor, luminary, rejoinder, thinker, collaborator, exaggerator, underperformer, emailer, confidante, accuser, detractors, opponent, persecutor, accusers, enemy, assailant, challenger, informer, opposers, producer, accomplice, conspirator

backbiter, defamer, hatemonger, libeler, maligner, muckraker, mudslinger, slanderer, traducer

faultfinder

depreciator, disparager, knocker