genus Aegypius vs bird genus

genus Aegypius and bird genus both are nouns.

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

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

genus Aegypius: a genus of Accipitridae, containing the cinereous vulture, also known as the black vulture, monk vulture, or Eurasian black vulture (Aegypius)
bird genus: a genus of birds

genus Aegypius (noun)	bird genus (noun)
a genus of Accipitridae, containing the cinereous vulture, also known as the black vulture, monk vulture, or Eurasian black vulture (Aegypius)	a genus of birds