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Definition of freak : 1. A sudden causeless change or turn of the mind; a whim of fancy; a capricious prank; a vagary or caprice.
2. To variegate; to checker; to streak.

Synonyms:

screwball, orchis, bug, hybrid, drug addict, repel, abnormality, testicle, junky, revolt, behemoth, sport, gross out, megrim, bee, maniac, mutation, aberration, Lusus Naturae, ball, anomaly, junkie, fanatic, conceit, bollock, malformation, colossus, crotchet, humor, rarity, goliath, mooncalf, misfit, nut case, testis, boutade, fruitcake, whim, fancy, caprice, notion, ballock, crackpot, concern, freak out, en, whimsy, vagary, impulse, egg, giant, oddity, curiosity, disgust, abortion, usual, monstrosity, teras, crank

aficionado, supporter, devotee, fiend, enthusiast, fan, zealot, nut, fancier, patron, addict, buff, connoisseur

hell hound, siren, ghoul, daemon, monster, archfiend, hell-raiser, Satan, specter, hellcat, ogre, sprite, imp, hellion, nixie, dragon, hobgoblin, incubus, werewolf, spirit, beast, goblin, demon, lamia, satyr, sylph, genie, devil, vampire, succubus, gnome, nymph, dwarf

Usage examples:

• Because the minute the Family gets wind of this, that you're writing some tell- all about Bartlett, they're going to freak. - "Syndrome", Thomas Hoover.
• Sir, she has risked her character by staying here- and I very much doubt if the world is likely to believe her own version of this extraordinary freak." - "Mattie:--A Stray (Vol 3 of 3)", Frederick William Robinson.
• " Unless he has freak business hours, as you and I do," I put in. - "The Gold Bag", Carolyn Wells.