gnawer vs sewellel

gnawer and sewellel both are nouns.

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

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

gnawer: relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing
sewellel: bulky nocturnal burrowing rodent of uplands of the Pacific coast of North America; the most primitive living rodent

gnawer (noun)	sewellel (noun)
relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing	bulky nocturnal burrowing rodent of uplands of the Pacific coast of North America; the most primitive living rodent