capybara vs gnawer

capybara and gnawer both are nouns.

Word	Noun	Adjective	Verb	Adverb
capybara	Yes	No	No	No
gnawer	Yes	No	No	No

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

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

Other hypernyms of capybara include rodent.

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