grassfinch vs weaverbird

grassfinch and weaverbird both are nouns.

Word	Noun	Adjective	Verb	Adverb
grassfinch	Yes	No	No	No
weaverbird	Yes	No	No	No

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

grassfinch: 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 grassfinch include weaver, weaver finch.

grassfinch (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