asshole vs unpleasant person

asshole and unpleasant person both are nouns.

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

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

asshole: insulting terms of address for people who are stupid or irritating or ridiculous
unpleasant person: a person who is not pleasant or agreeable

Other hypernyms of asshole include disagreeable person.

asshole (noun)	unpleasant person (noun)
vulgar slang for anus	a person who is not pleasant or agreeable
insulting terms of address for people who are stupid or irritating or ridiculous