genus Myocastor vs mammal genus

genus Myocastor and mammal genus both are nouns.

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

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

genus Myocastor (noun)	mammal genus (noun)
a genus of Capromyidae	a genus of mammals