fiend
[fēnd]
NOUN
fiends (plural noun)
an evil spirit or demon.
synonyms:
demon · devil · evil spirit · imp · bogie · incubus · succubus · hellhound · spook · cacodemon
archaic
(the fiend)
the Devil.
a wicked or cruel person.
“a fiend thirsty for blood and revenge”
synonyms:
brute · beast · villain · barbarian · monster · ogre · sadist · evil-doer · baddie · swine · blackguard
informal
a person who is excessively fond of or addicted to something.
“the restaurant’s owner is a wine fiend”
synonyms:
enthusiast · fanatic · maniac · addict · devotee · fan · lover · follower · aficionado · connoisseur · appreciator · buff · freak · nut · ham · sucker · great one
ORIGIN
Old English fēond ‘an enemy, the devil, a demon’, of Germanic origin; related to Dutch vijand and German Feind ‘enemy’.
Mws R Writings 