muskrat vs Ondatra zibethica

muskrat and Ondatra zibethica both are nouns.

Word	Noun	Adjective	Verb	Adverb
muskrat	Yes	No	No	No
Ondatra zibethica	Yes	No	No	No

As nouns, muskrat and Ondatra zibethica are synonyms defined as:

muskrat and Ondatra zibethica: beaver-like aquatic rodent of North America with dark glossy brown fur

Other synonyms of muskrat include musquash.

muskrat (noun)	Ondatra zibethica (noun)
beaver-like aquatic rodent of North America with dark glossy brown fur	beaver-like aquatic rodent of North America with dark glossy brown fur
the brown fur of a muskrat