smooth alder vs Alnus serrulata

smooth alder and Alnus serrulata both are nouns.

Word	Noun	Adjective	Verb	Adverb
smooth alder	Yes	No	No	No
Alnus serrulata	Yes	No	No	No

As nouns, smooth alder and Alnus serrulata are synonyms defined as:

smooth alder and Alnus serrulata: common shrub of the eastern United States with smooth bark

Other synonyms of smooth alder include hazel alder.

smooth alder (noun)	Alnus serrulata (noun)
common shrub of the eastern United States with smooth bark	common shrub of the eastern United States with smooth bark