Antilocapra vs mammal genus

Antilocapra and mammal genus both are nouns.

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

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

Antilocapra: type and sole genus of the Antilocapridae comprising one species
mammal genus: a genus of mammals

Antilocapra (noun)	mammal genus (noun)
type and sole genus of the Antilocapridae comprising one species	a genus of mammals