genus Cursorius vs bird genus

genus Cursorius and bird genus both are nouns.

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

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

genus Cursorius (noun)	bird genus (noun)
a genus of coursers (Cursorius)	a genus of birds