joker vs unpleasant person

joker and unpleasant person both are nouns.

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

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

Other hypernyms of joker include disagreeable person.

joker (noun)	unpleasant person (noun)
a playing card that is usually printed with a picture of a jester	a person who is not pleasant or agreeable
an inconspicuous clause in a document or bill that affects its meaning in a way that is not immediately apparent
a person who enjoys telling or playing jokes
a person who does something thoughtless or annoying