rat chinchilla vs gnawer

rat chinchilla and gnawer both are nouns.

Word	Noun	Adjective	Verb	Adverb
rat chinchilla	Yes	No	No	No
gnawer	Yes	No	No	No

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

rat chinchilla: ratlike rodent with soft fur and large ears of the Andes
gnawer: relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing

Other hypernyms of rat chinchilla include rodent.

rat chinchilla (noun)	gnawer (noun)
ratlike rodent with soft fur and large ears of the Andes	relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing