genus Citellus vs mammal genus

genus Citellus and mammal genus both are nouns.

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

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

genus Citellus (noun)	mammal genus (noun)
typical ground squirrels	a genus of mammals