coypu vs rodent

coypu and rodent both are nouns.

Word	Noun	Adjective	Verb	Adverb
coypu	Yes	No	No	No
rodent	Yes	No	No	No

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

coypu: aquatic South American rodent resembling a small beaver; bred for its fur
rodent: relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing

Other hypernyms of coypu include gnawer.

coypu (noun)	rodent (noun)
aquatic South American rodent resembling a small beaver; bred for its fur	relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing