Meriones vs mammal genus

Meriones and mammal genus both are nouns.

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

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

Meriones: a genus of Cricetidae containing most animals referred to as jirds (Meriones)
mammal genus: a genus of mammals

Meriones (noun)	mammal genus (noun)
a genus of Cricetidae containing most animals referred to as jirds (Meriones)	a genus of mammals