sneerer vs unpleasant person

sneerer and unpleasant person both are nouns.

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

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

Other hypernyms of sneerer include disagreeable person.

sneerer (noun)	unpleasant person (noun)
a person who expresses contempt by remarks or facial expression	a person who is not pleasant or agreeable