genus Sorex vs mammal genus

genus Sorex and mammal genus both are nouns.

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

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

genus Sorex (noun)	mammal genus (noun)
type genus of the family Soricidae: shrews	a genus of mammals