Acer rubrum vs red maple

Acer rubrum and red maple both are nouns.

Word	Noun	Adjective	Verb	Adverb
Acer rubrum	Yes	No	No	No
red maple	Yes	No	No	No

As nouns, Acer rubrum and red maple are synonyms defined as:

Acer rubrum and red maple: maple of eastern and central America; five-lobed leaves turn scarlet and yellow in autumn

Other synonyms of Acer rubrum include scarlet maple, swamp maple.

Acer rubrum (noun)	red maple (noun)
maple of eastern and central America; five-lobed leaves turn scarlet and yellow in autumn	maple of eastern and central America; five-lobed leaves turn scarlet and yellow in autumn