genus Crax vs bird genus

genus Crax and bird genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Crax	Yes	No	No	No
bird genus	Yes	No	No	No

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

genus Crax (noun)	bird genus (noun)
type genus of the Cracidae: curassows	a genus of birds