genus Macropus vs mammal genus

genus Macropus and mammal genus both are nouns.

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

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

genus Macropus: type genus of the family Macropodidae: typical kangaroos and wallabies
mammal genus: a genus of mammals

genus Macropus (noun)	mammal genus (noun)
type genus of the family Macropodidae: typical kangaroos and wallabies	a genus of mammals