chinchilla rat vs gnawer

chinchilla rat and gnawer both are nouns.

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

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

chinchilla rat: 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 chinchilla rat include rodent.

chinchilla rat (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