grass finch vs weaverbird

grass finch and weaverbird both are nouns.

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

As nouns, weaverbird is a hypernym of grass finch; that is, weaverbird is a word with a broader meaning than grass finch:

grass finch: usually brightly-colored Australian weaverbirds; often kept as cage birds
weaverbird: finch-like African and Asian colonial birds noted for their elaborately woven nests

Other hypernyms of grass finch include weaver, weaver finch.

grass finch (noun)	weaverbird (noun)
usually brightly-colored Australian weaverbirds; often kept as cage birds	finch-like African and Asian colonial birds noted for their elaborately woven nests
common North American finch noted for its evening song