Ondatra zibethica vs rodent

Ondatra zibethica and rodent both are nouns.

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

As nouns, rodent is a hypernym of Ondatra zibethica; that is, rodent is a word with a broader meaning than Ondatra zibethica:

Ondatra zibethica: beaver-like aquatic rodent of North America with dark glossy brown fur
rodent: relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing

Other hypernyms of Ondatra zibethica include gnawer.

Ondatra zibethica (noun)	rodent (noun)
beaver-like aquatic rodent of North America with dark glossy brown fur	relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing