Bathyergus vs mammal genus

Bathyergus and mammal genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bathyergus	Yes	No	No	No
mammal genus	Yes	No	No	No

As nouns, mammal genus is a hypernym of Bathyergus; that is, mammal genus is a word with a broader meaning than Bathyergus:

Bathyergus: the genus of dune mole-rats, containing the Namaqua dune mole-rat and the Cape dune mole-rat (Bathyergus)
mammal genus: a genus of mammals

Bathyergus (noun)	mammal genus (noun)
the genus of dune mole-rats, containing the Namaqua dune mole-rat and the Cape dune mole-rat (Bathyergus)	a genus of mammals