Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

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. [Supernatural appearance] ghost, revenant, specter, apparition, spirit, shade, shadow, vision; hobglobin, goblin, orc; wraith, spook, boggart†, banshee, loup-garou [Fr.], lemures†; evil eye. merman, mermaid, merfolk†; siren; satyr, faun; manito†, manitou, manitu. possession, demonic possession, diabolic possession; insanity &c 503. [in jest, in science] Maxwell's demon. [person possessed by a demon] demoniac. Adj. demonic, demonical, impish, demoniacal; fiendish, fiend-like; supernatural, weird, uncanny, unearthly, spectral; ghostly, ghost-like; elfin, elvin†, elfish, elflike†; haunted; pokerish [U.S.]. possessed, possessed by a devil, possessed by a demon. Adv. demonically.