weirdo vs unpleasant person

weirdo and unpleasant person both are nouns.

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

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

Other hypernyms of weirdo include disagreeable person.

weirdo (noun)	unpleasant person (noun)
someone unpleasantly strange or eccentric	a person who is not pleasant or agreeable
someone deranged and possibly dangerous