wood warbler vs New World warbler

wood warbler and New World warbler both are nouns.

Word	Noun	Adjective	Verb	Adverb
wood warbler	Yes	No	No	No
New World warbler	Yes	No	No	No

As nouns, wood warbler and New World warbler are synonyms defined as:

wood warbler and New World warbler: small bright-colored American songbird with a weak unmusical song

wood warbler (noun)	New World warbler (noun)
small bright-colored American songbird with a weak unmusical song	small bright-colored American songbird with a weak unmusical song
European woodland warbler with dull yellow plumage