hazel alder vs Alnus serrulata

hazel alder and Alnus serrulata both are nouns.

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

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

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

Other synonyms of hazel alder include smooth alder.

hazel 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