Acer spicatum vs mountain alder

Acer spicatum and mountain alder both are nouns.

Word	Noun	Adjective	Verb	Adverb
Acer spicatum	Yes	No	No	No
mountain alder	Yes	No	No	No

As nouns, Acer spicatum and mountain alder are synonyms defined as:

Acer spicatum and mountain alder: small shrubby maple of eastern North America; scarlet in autumn

Other synonyms of Acer spicatum include mountain maple.

Acer spicatum (noun)	mountain alder (noun)
small shrubby maple of eastern North America; scarlet in autumn	small shrubby maple of eastern North America; scarlet in autumn
	tree of western United States