genus Haliaeetus vs bird genus

genus Haliaeetus and bird genus both are nouns.

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

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

genus Haliaeetus: a genus of Accipitridae, containing the sea eagles (Haliaeetus)
bird genus: a genus of birds

genus Haliaeetus (noun)	bird genus (noun)
a genus of Accipitridae, containing the sea eagles (Haliaeetus)	a genus of birds