barbarian vs unpleasant person

barbarian and unpleasant person both are nouns.

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

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

Other hypernyms of barbarian include disagreeable person.

barbarian (noun)	unpleasant person (noun)
a member of an uncivilized people	a person who is not pleasant or agreeable
a crude uncouth ill-bred person lacking culture or refinement

barbarian (adjective)	unpleasant person (adjective)
without civilizing influences