Myocastor coypus vs gnawer

Myocastor coypus and gnawer both are nouns.

Word	Noun	Adjective	Verb	Adverb
Myocastor coypus	Yes	No	No	No
gnawer	Yes	No	No	No

As nouns, gnawer is a hypernym of Myocastor coypus; that is, gnawer is a word with a broader meaning than Myocastor coypus:

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

Other hypernyms of Myocastor coypus include rodent.

Myocastor coypus (noun)	gnawer (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