genus Canis vs mammal genus

genus Canis and mammal genus both are nouns.

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

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

genus Canis: type genus of the Canidae: domestic and wild dogs, wolves, jackals
mammal genus: a genus of mammals

genus Canis (noun)	mammal genus (noun)
type genus of the Canidae: domestic and wild dogs, wolves, jackals	a genus of mammals