yellowbird vs New World goldfinch

yellowbird and New World goldfinch both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellowbird	Yes	No	No	No
New World goldfinch	Yes	No	No	No

As nouns, yellowbird and New World goldfinch are synonyms defined as:

yellowbird and New World goldfinch: American finch whose male has yellow body plumage in summer

Other synonyms of yellowbird include goldfinch, Spinus tristis.

yellowbird (noun)	New World goldfinch (noun)
American finch whose male has yellow body plumage in summer	American finch whose male has yellow body plumage in summer
yellow-throated American wood warbler