genus Sagittarius vs bird genus

genus Sagittarius and bird genus both are nouns.

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

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

genus Sagittarius (noun)	bird genus (noun)
type genus of the Sagittariidae	a genus of birds