grass finch vs Pooecetes

grass finch and Pooecetes both are nouns.

Word	Noun	Adjective	Verb	Adverb
grass finch	Yes	No	No	No
Pooecetes	Yes	No	No	No

grass finch (noun)	Pooecetes (noun)
usually brightly-colored Australian weaverbirds; often kept as cage birds	a genus of Fringillidae, containing the vesper sparrow (Pooecetes)
common North American finch noted for its evening song