dirt ball vs unpleasant person

dirt ball and unpleasant person both are nouns.

Word	Noun	Adjective	Verb	Adverb
dirt ball	Yes	No	No	No
unpleasant person	Yes	No	No	No

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

dirt ball: a person who has a nasty or unethical character undeserving of respect
unpleasant person: a person who is not pleasant or agreeable

Other hypernyms of dirt ball include disagreeable person.

dirt ball (noun)	unpleasant person (noun)
a person who has a nasty or unethical character undeserving of respect	a person who is not pleasant or agreeable