dullard vs unpleasant person

dullard and unpleasant person both are nouns.

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

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

Other hypernyms of dullard include disagreeable person.

dullard (noun)	unpleasant person (noun)
a person who evokes boredom	a person who is not pleasant or agreeable
a person who is not very bright