genus Physeter vs mammal genus

genus Physeter and mammal genus both are nouns.

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

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

genus Physeter (noun)	mammal genus (noun)
type genus of the Physeteridae	a genus of mammals