genus Passer vs bird genus

genus Passer and bird genus both are nouns.

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

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

genus Passer (noun)	bird genus (noun)
type genus of the Passeridae	a genus of birds