mole rat vs gnawer

mole rat and gnawer both are nouns.

Word	Noun	Adjective	Verb	Adverb
mole rat	Yes	No	No	No
gnawer	Yes	No	No	No

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

mole rat: African rodent resembling a mole in habits and appearance
gnawer: relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing

Other hypernyms of mole rat include rodent.

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

mole rat: furry short-limbed tailless rodent resembling a true mole in habits and appearance; of eastern Europe and Middle East
gnawer: relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing

Other hypernyms of mole rat include rodent.

mole rat (noun)	gnawer (noun)
African rodent resembling a mole in habits and appearance	relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing
burrowing scaly-tailed rat of India and Ceylon
furry short-limbed tailless rodent resembling a true mole in habits and appearance; of eastern Europe and Middle East