Lagostomus maximus vs rodent

Lagostomus maximus and rodent both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lagostomus maximus	Yes	No	No	No
rodent	Yes	No	No	No

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

Lagostomus maximus: gregarious burrowing rodent larger than the chinchillas
rodent: relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing

Other hypernyms of Lagostomus maximus include gnawer.

Lagostomus maximus (noun)	rodent (noun)
gregarious burrowing rodent larger than the chinchillas	relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing