genus Anas vs bird genus

genus Anas and bird genus both are nouns.

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

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

genus Anas (noun)	bird genus (noun)
type genus of the Anatidae: freshwater ducks	a genus of birds