Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun demon

3 senses of demon

Sense 1
devil, fiend, demon, daemon, daimon -- (an evil supernatural being)
       => evil spirit -- (a spirit tending to cause harm)

Sense 2
monster, fiend, devil, demon, ogre -- (a cruel wicked and inhuman person)
       => unpleasant person, disagreeable person -- (a person who is not pleasant or agreeable)

Sense 3
demon -- (someone extremely diligent or skillful; "he worked like a demon to finish the job on time"; "she's a demon at math")
       => actor, doer, worker -- (a person who acts and gets things done; "he's a principal actor in this affair"; "when you want something done get a doer"; "he's a miracle worker")