demon1

noun

• 1an evil spirit or devil, especially one thought to possess a person or act as a tormentor in hell: he was possessed by an evil demon each of the damned souls was guarded by a group of hideous demons
• a cruel, evil, or unmanageable person:I was a little demon, I can tell you
• a powerful, often destructive compulsion or obsession:he is plagued by demons which go back to his childhood
• something very insidious and harmful:the demon of sexism [as modifier]:the demon drink
• [mass noun] reckless mischief; devilry:his eyes are bursting with pure demon

• 2 [often as modifier] a forceful or skilful performer of a specified activity:a friend of mine is a demon cook

• 3another term for daemon¹ (sense 1).