An evil spirit.

synonyms: bogey, bogy.

Roget 980: 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.    [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 etc. 503.    [in jest, in science] Maxwell's demon.    [person possessed by a demon] demoniac.    ... show more

An unidentified (and possibly enemy) aircraft.

synonyms: bogey, bogy.