grass finch vs grassfinch

grass finch and grassfinch both are nouns.

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

As nouns, grass finch and grassfinch are synonyms defined as:

grass finch and grassfinch: usually brightly-colored Australian weaverbirds; often kept as cage birds

grass finch (noun)	grassfinch (noun)
usually brightly-colored Australian weaverbirds; often kept as cage birds	usually brightly-colored Australian weaverbirds; often kept as cage birds
common North American finch noted for its evening song