genus Coracias vs bird genus

genus Coracias and bird genus both are nouns.

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

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

genus Coracias (noun)	bird genus (noun)
type genus of the Coraciidae	a genus of birds