Alnus serrulata vs smooth alder

Alnus serrulata and smooth alder both are nouns.

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

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

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

Other synonyms of Alnus serrulata include hazel alder.

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