genus Trichecus vs mammal genus

genus Trichecus and mammal genus both are nouns.

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

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

genus Trichecus (noun)	mammal genus (noun)
type and sole genus of the Trichechidae	a genus of mammals