rodent vs capibara

rodent and capibara both are nouns.

Word	Noun	Adjective	Verb	Adverb
rodent	Yes	No	No	No
capibara	Yes	No	No	No

As nouns, capibara is a hyponym of rodent; that is, capibara is a word with a more specific, narrower meaning than rodent:

rodent: relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing
capibara: pig-sized tailless South American amphibious rodent with partly webbed feet; largest living rodent

rodent (noun)	capibara (noun)
relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing	pig-sized tailless South American amphibious rodent with partly webbed feet; largest living rodent