tulip tree vs white poplar

tulip tree and white poplar both are nouns.

Word	Noun	Adjective	Verb	Adverb
tulip tree	Yes	No	No	No
white poplar	Yes	No	No	No

tulip tree (noun)	white poplar (noun)
tall North American deciduous timber tree having large tulip-shaped greenish yellow flowers and conelike fruit; yields soft white woods used especially for cabinet work	a poplar that is widely cultivated in the United States; has white bark and leaves with whitish undersurfaces
	light easily worked wood of a tulip tree; used for furniture and veneer