stinkpot vs unpleasant person

stinkpot and unpleasant person both are nouns.

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

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

Other hypernyms of stinkpot include disagreeable person.

stinkpot (noun)	unpleasant person (noun)
small freshwater turtle having a strong musky odor	a person who is not pleasant or agreeable
a person who is deemed to be despicable or contemptible