ovenbird vs New World warbler

ovenbird and New World warbler both are nouns.

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

As nouns, New World warbler is a hypernym of ovenbird; that is, New World warbler is a word with a broader meaning than ovenbird:

ovenbird: American warbler; builds a dome-shaped nest on the ground
New World warbler: small bright-colored American songbird with a weak unmusical song

Other hypernyms of ovenbird include wood warbler.

ovenbird (noun)	New World warbler (noun)
American warbler; builds a dome-shaped nest on the ground	small bright-colored American songbird with a weak unmusical song
small brownish South American birds that build oven-shaped clay nests