big-leaf maple vs Oregon maple

big-leaf maple and Oregon maple both are nouns.

Word	Noun	Adjective	Verb	Adverb
big-leaf maple	Yes	No	No	No
Oregon maple	Yes	No	No	No

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

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

Other synonyms of big-leaf maple include Acer macrophyllum.

big-leaf maple (noun)	Oregon maple (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