devil vs unpleasant person

devil and unpleasant person both are nouns.

Word	Noun	Adjective	Verb	Adverb
devil	Yes	No	Yes	No
unpleasant person	Yes	No	No	No

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

Other hypernyms of devil include disagreeable person.

devil (noun)	unpleasant person (noun)
a word used in exclamations of confusion	a person who is not pleasant or agreeable
an evil supernatural being
a cruel wicked and inhuman person
a rowdy or mischievous person (usually a young man)

devil (verb)	unpleasant person (verb)
coat or stuff with a spicy paste
cause annoyance in; disturb, especially by minor irritations