musk turtle vs mud turtle

musk turtle and mud turtle both are nouns.

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

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

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

musk turtle (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