genus Bos vs mammal genus

genus Bos and mammal genus both are nouns.

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

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

genus Bos: wild and domestic cattle; in some classifications placed in the subfamily Bovinae or tribe Bovini
mammal genus: a genus of mammals

genus Bos (noun)	mammal genus (noun)
wild and domestic cattle; in some classifications placed in the subfamily Bovinae or tribe Bovini	a genus of mammals