Deviled and Demon

noun

• An evil supernatural being.
  • synonyms: devil, fiend, daemon, daimon
• A cruel wicked and inhuman person.
  • synonyms: monster, fiend, devil, ogre
• Someone extremely diligent or skillful.
  • usage: "he worked like a demon to finish the job on time"; "she's a demon at math"

• (n.) One's genius; a tutelary spirit or internal voice; as, the demon of Socrates.
• (n.) A spirit or immaterial being, holding a middle place between men and deities in pagan mythology.
• (n.) An evil spirit; a devil.