Equus vs mammal genus

Equus and mammal genus both are nouns.

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

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

Equus: type genus of the Equidae: only surviving genus of the family Equidae
mammal genus: a genus of mammals

Equus (noun)	mammal genus (noun)
type genus of the Equidae: only surviving genus of the family Equidae	a genus of mammals