scarlet maple vs red maple

scarlet maple and red maple both are nouns.

Word	Noun	Adjective	Verb	Adverb
scarlet maple	Yes	No	No	No
red maple	Yes	No	No	No

As nouns, scarlet maple and red maple are synonyms defined as:

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

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

scarlet maple (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