gnawer vs prairie dog

gnawer and prairie dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
gnawer	Yes	No	No	No
prairie dog	Yes	No	No	No

As nouns, prairie dog is a hyponym of gnawer; that is, prairie dog 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
prairie dog: any of several rodents of North American prairies living in large complex burrows having a barking cry

gnawer (noun)	prairie dog (noun)
relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing	any of several rodents of North American prairies living in large complex burrows having a barking cry