white poplar vs Liriodendron tulipifera

white poplar and Liriodendron tulipifera both are nouns.

Word	Noun	Adjective	Verb	Adverb
white poplar	Yes	No	No	No
Liriodendron tulipifera	Yes	No	No	No

white poplar (noun)	Liriodendron tulipifera (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