yellowbird vs wood warbler

yellowbird and wood warbler both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellowbird	Yes	No	No	No
wood warbler	Yes	No	No	No

As nouns, wood warbler is a hypernym of yellowbird; that is, wood warbler is a word with a broader meaning than yellowbird:

yellowbird: yellow-throated American wood warbler
wood warbler: small bright-colored American songbird with a weak unmusical song

Other hypernyms of yellowbird include New World warbler.

yellowbird (noun)	wood warbler (noun)
American finch whose male has yellow body plumage in summer	small bright-colored American songbird with a weak unmusical song
yellow-throated American wood warbler	European woodland warbler with dull yellow plumage