Spizella vs bird genus

Spizella and bird genus both are nouns.

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

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

Spizella (noun)	bird genus (noun)
chipping sparrow; field sparrow; tree sparrow	a genus of birds