genus Coccyzus vs bird genus

genus Coccyzus and bird genus both are nouns.

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

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

genus Coccyzus: a genus of Cuculidae containing cuckoos which live in the Americas (Coccyzus)
bird genus: a genus of birds

genus Coccyzus (noun)	bird genus (noun)
a genus of Cuculidae containing cuckoos which live in the Americas (Coccyzus)	a genus of birds