stinkpot vs mud turtle

stinkpot and mud turtle both are nouns.

Word	Noun	Adjective	Verb	Adverb
stinkpot	Yes	No	No	No
mud turtle	Yes	No	No	No

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

stinkpot: small freshwater turtle having a strong musky odor
mud turtle: bottom-dwelling freshwater turtle inhabiting muddy rivers of North America and Central America

stinkpot (noun)	mud turtle (noun)
small freshwater turtle having a strong musky odor	bottom-dwelling freshwater turtle inhabiting muddy rivers of North America and Central America
a person who is deemed to be despicable or contemptible