Synonyms for "fanatic": dissenter, enthusiast, radical, bigot, maniac, devotee, activist, supporter, follower, partisan, ultra, missionary, disciple, apostle, propagandist, crusader, visionary, idealist, purist, sectarian, dogmatist, apologist, defender, vindicator, champion, advocate, protagonist, pioneer, reformer, revolutionist, iconoclast, militant, terrorist, freedom fighter, insurgent, rebel, zealot, agitator, demagogue, rabble-rouser, troublemaker, firebrand, incendiary, heretic, apostate, renegade, traitor, deserter, informer, spy, double agent, quisling, collaborator, opportunist, sycophant, parasite, deadbeat, loafer, slacker, hypocrite, charlatan, quack, con man, fraud, liar, perjurer, gossip, tattletale, busybody, interloper, poacher, smuggler, pirate, buccaneer, corsair, filibuster, privateer, marauder, spoiler, vandal, thug, hoodlum, gangster, mobster, mafioso, racketeer, tormentor, bully, despot, tyrant, dictator, autocrat, totalitarian, nazi, communist, socialist, capitalist, nationalist, patriot, loyalist, aristocrat, oligarch, democrat, republican, conservative, liberal, progressive, environmentalist, feminist, pacifist, vegetarian, vegan, atheist, agnostic, skeptic, cynic, existentialist, absurdist, stoic, hedonist, epicurean, ascetic, mystic, guru, sage, scholar, expert, authority, connoisseur, afficionado, lover, fan, buff, addict, junkie, fiend, freak, nut, kook, crackpot, eccentric, maverick, nonconformist, outlaw.