trade surplus vs surplusage

trade surplus and surplusage both are nouns.

Word	Noun	Adjective	Verb	Adverb
trade surplus	Yes	No	No	No
surplusage	Yes	No	No	No

As nouns, surplusage is a hypernym of trade surplus; that is, surplusage is a word with a broader meaning than trade surplus:

Other hypernyms of trade surplus include excess, nimiety, surplus.

trade surplus (noun)	surplusage (noun)
an excess of exports over imports.	a quantity much larger than is needed