genus Chordeiles vs bird genus

genus Chordeiles and bird genus both are nouns.

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

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

genus Chordeiles: a genus of Caprimulgidae, containing the nighthawks (Chordeiles)
bird genus: a genus of birds

genus Chordeiles (noun)	bird genus (noun)
a genus of Caprimulgidae, containing the nighthawks (Chordeiles)	a genus of birds