chinchilla rat vs rodent

chinchilla rat and rodent both are nouns.

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

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

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

Other hypernyms of chinchilla rat include gnawer.

chinchilla rat (noun)	rodent (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