THESAURUS
Imp
Ariel, Befind, Corrigan, Dingbelle, Fifinella, Finnbeara, Hob, Hobgoblin, JD, Mab, Oberon, Puck, Titania, appendage, arm, bad boy, bad fairy, bad peri, banshee, booger, bough, branch, brat, brownie, buffoon, bugger, cluricaune, cutup, devil, deviling, devilkin, diablotin, dwarf, elf, enfant terrible, erlking, fairy, fairy queen, fay, funmaker, gamin, gnome, goblin, gremlin, hand, hob, hobgoblin, holy terror, hood, hoodlum, hooligan, joint, joker, jokester, juvenile delinquent, knave, kobold, leg, leprechaun, limb, link, little devil, little monkey, little rascal, lobe, lobule, member, minx, mischief, mischief-maker, monkey, offshoot, organ, ouphe, peri, pinion, pixie, poltergeist, pooka, practical joker, prankster, puca, puck, punk, punk kid, pwca, ramification, rapscallion, rascal, rogue, rowdy, ruffian, runner, scamp, scapegrace, scion, spoiled brat, spray, sprig, sprite, spur, switch, sylph, sylphid, tail, tendril, tokoloshe, troll, twig, urchin, wag, whippersnapper, wing, young devil
ROGET THESAURUS
Imp
Demon
N
demon, daemon, demonry, demonology, evil genius, fiend, familiar, daeva, devil, bad spirit, unclean spirit, cacodemon, incubus, Eblis, shaitan, succubus, succuba, Frankenstein's monster, Titan, Shedim, Mephistopheles, Asmodeus, Moloch, Belial, Ahriman, fury, harpy, Friar Rush, vampire, ghoul, afreet, barghest, Loki, ogre, ogress, gnome, gin, jinn, imp, deev, lamia, bogie, bogeyman, bogle, nis, kobold, flibbertigibbet, fairy, brownie, pixy, elf, dwarf, urchin, Puck, Robin Goodfellow, leprechaun, Cluricaune, troll, dwerger, sprite, ouphe, bad fairy, nix, nixie, pigwidgeon, will-o'-the wisp, ghost, revenant, specter, apparition, spirit, shade, shadow, vision, hobglobin, goblin, orc, wraith, spook, boggart, banshee, loup-garou, lemures, evil eye, merman, mermaid, merfolk, siren, satyr, faun, manito, manitou, manitu, possession, demonic possession, diabolic possession, insanity, Maxwell's demon, demoniac, demonic, demonical, impish, demoniacal, fiendish, fiend-like, supernatural, weird, uncanny, unearthly, spectral, ghostly, ghost-like, elfin, elvin, elfish, elflike, haunted, pokerish, possessed, possessed by a devil, possessed by a demon, demonically.