mountain maple vs mountain alder

mountain maple and mountain alder both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain maple	Yes	No	No	No
mountain alder	Yes	No	No	No

As nouns, mountain maple and mountain alder are synonyms defined as:

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

Other synonyms of mountain maple include Acer spicatum.

mountain maple (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