grassfinch vs grass finch

grassfinch and grass finch both are nouns.

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

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

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

grassfinch (noun)	grass finch (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