demon

demon is a   Noun

Definition:

[1] A spirit, or immaterial being, holding a middle place between men and deities in pagan mythology. The demon kind is of an inSydenham.

[2] One`s genius; a tutelary spirit or internal voice; as, the demon of Socrates. [Often written dæmon.]

[3] An evil spirit; a devil. That same demon that hath gulled thee thus. Shak.

Synonyms: