demon
n//ˈdiː.mən//demon, djävul, baddare, överdängare
An evil spirit resident in or working for Hell; a devil. [from 10th c.]
(now, chiefly, historical) A false god or idol; a Satanic divinity. [from 10th c.]
Someone with great strength, passion or skill for a particular activity, pursuit etc.; an enthusiast. [from 19th c.]