big-leaf maple vs Acer macrophyllum

big-leaf maple and Acer macrophyllum both are nouns.

Word	Noun	Adjective	Verb	Adverb
big-leaf maple	Yes	No	No	No
Acer macrophyllum	Yes	No	No	No

As nouns, big-leaf maple and Acer macrophyllum are synonyms defined as:

big-leaf maple and Acer macrophyllum: maple of western North America having large 5-lobed leaves orange in autumn

Other synonyms of big-leaf maple include Oregon maple.

big-leaf maple (noun)	Acer macrophyllum (noun)
maple of western North America having large 5-lobed leaves orange in autumn	maple of western North America having large 5-lobed leaves orange in autumn