n. 25B6; noun
a fiend had taken possession of him : DEMON, devil, evil spirit, bogie, cacodemon; informal spook.
a fiend bent on global evil-doing : BRUTE, beast, villain, barbarian, monster, ogre, sadist, evil-doer; informal swine.
(informal) a drug fiend : ADDICT, abuser, user; informal junkie, head/freak.
(informal) I'm a fiend for Mexican food : ENTHUSIAST, maniac; devotee, fan, lover; informal fanatic, addict, buff, freak, nut.