genus Felis vs mammal genus

genus Felis and mammal genus both are nouns.

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

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

genus Felis (noun)	mammal genus (noun)
type genus of the Felidae: true cats and most wildcats	a genus of mammals