Synonyms for Demon:

n.

Satan (noun)
deuce, lucifer, beelzebub, serpent, mephistopheles.
cursed, demonic, possessed, accursed, exorcise, possession, exorcism. best, superman, exponent, prodigy, queen, artist, old hand, past master, maestro, master. blanket, demons, bogey, canker, concern, anxiety, bugbear, cancer, bogie, bugaboo. demon (noun)
daimon, fiend, daemon, ogre, monster.
evil, devilish being or influence (noun)
rascal, monster, vampire, goblin, archfiend, beast, brute, incubus, fiend, rogue, succubus, imp, hellion.
evildoer (noun)
criminal, tyrant, evildoer, gunman, desperado, crook, scoundrel, snake, terrorist, law breaker, bad guy, viper, thief, tough, cutthroat, hoodlum, hooligan, brute, vandal, wrongdoer, thug, vulture, ruffian, bully.
evil spirit (noun)
gnome, fiend, goblin, nymph, Nixie, werewolf, beast, ghoul, incubus, hobgoblin, dragon, sylph, specter, sprite, lamia, Genie, imp, monster, siren, dwarf, archfiend, satyr, freak, hellcat, ogre, succubus, hell-raiser, hell hound, vampire, hellion.
ghost (noun)
specter, vampire, daemon.
satan (noun)
deuce, fiend, serpent, beelzebub, lucifer, archfiend, mephistopheles.
troublemaker (noun)
hellion.
villain (noun)
rogue, rascal.

Other synonyms:

cursed, demonic, possessed, accursed, exorcise, possession, exorcism. Other relevant words:
canker, cancer, best, superman, possession, artist, queen, bogey, daimon, exorcism, rascal, exorcise, bogie, maestro, anxiety, accursed, bugaboo, blanket, master, cursed, possessed, demons, rogue, concern, demonic, exponent, bugbear, prodigy.

Usage examples for demon

  1. The demon of victory seems to have seized him." – Dave Darrin's Fourth Year at Annapolis by H. Irving Hancock
  2. It was the sport of a demon – The Anti-Slavery Examiner, Omnibus by American Anti-Slavery Society
  3. Resolutely, day after day and year after year, she had fought against the demon of remorse. – The Gadfly by E. L. Voynich