box elder vs ash-leaved maple

box elder and ash-leaved maple both are nouns.

Word	Noun	Adjective	Verb	Adverb
box elder	Yes	No	No	No
ash-leaved maple	Yes	No	No	No

As nouns, box elder and ash-leaved maple are synonyms defined as:

box elder and ash-leaved maple: common shade tree of eastern and central United States

Other synonyms of box elder include Acer negundo.

box elder (noun)	ash-leaved maple (noun)
common shade tree of eastern and central United States	common shade tree of eastern and central United States