genus Pandion vs bird genus

genus Pandion and bird genus both are nouns.

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

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

genus Pandion (noun)	bird genus (noun)
type genus of the Pandionidae	a genus of birds