Alnus serrulata vs hazel alder

Alnus serrulata and hazel alder both are nouns.

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

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

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

Other synonyms of Alnus serrulata include smooth alder.

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