genus Blarina vs mammal genus

genus Blarina and mammal genus both are nouns.

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

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

genus Blarina: a genus of fairly large shrews with fairly short tails (Blarina)
mammal genus: a genus of mammals

genus Blarina (noun)	mammal genus (noun)
a genus of fairly large shrews with fairly short tails (Blarina)	a genus of mammals