genus Homo vs mammal genus

genus Homo and mammal genus both are nouns.

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

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

genus Homo (noun)	mammal genus (noun)
type genus of the family Hominidae	a genus of mammals