aggravator vs unpleasant person

aggravator and unpleasant person both are nouns.

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

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

Other hypernyms of aggravator include disagreeable person.

aggravator (noun)	unpleasant person (noun)
an unpleasant person who is annoying or exasperating	a person who is not pleasant or agreeable