genus Caprimulgus vs bird genus

genus Caprimulgus and bird genus both are nouns.

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

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

genus Caprimulgus (noun)	bird genus (noun)
type genus of the Caprimulgidae	a genus of birds