grass finch vs genus Pooecetes

grass finch and genus Pooecetes both are nouns.

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

grass finch (noun)	genus 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