box elder vs Acer negundo

box elder and Acer negundo both are nouns.

Word	Noun	Adjective	Verb	Adverb
box elder	Yes	No	No	No
Acer negundo	Yes	No	No	No

As nouns, box elder and Acer negundo are synonyms defined as:

box elder and Acer negundo: common shade tree of eastern and central United States

Other synonyms of box elder include ash-leaved maple.

box elder (noun)	Acer negundo (noun)
common shade tree of eastern and central United States	common shade tree of eastern and central United States