demon vs disagreeable person

demon and disagreeable person both are nouns.

Word	Noun	Adjective	Verb	Adverb
demon	Yes	No	No	No
disagreeable person	Yes	No	No	No

As nouns, disagreeable person is a hypernym of demon; that is, disagreeable person is a word with a broader meaning than demon:

Other hypernyms of demon include unpleasant person.

demon (noun)	disagreeable person (noun)
an evil supernatural being	a person who is not pleasant or agreeable
a cruel wicked and inhuman person
someone extremely diligent or skillful