white poplar vs tulip tree

white poplar and tulip tree both are nouns.

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

white poplar (noun)	tulip tree (noun)
a poplar that is widely cultivated in the United States; has white bark and leaves with whitish undersurfaces	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
light easily worked wood of a tulip tree; used for furniture and veneer