excess vs trade surplus

excess and trade surplus both are nouns.

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

As nouns, trade surplus is a hyponym of excess; that is, trade surplus is a word with a more specific, narrower meaning than excess:

excess (noun)	trade surplus (noun)
excessive indulgence	an excess of exports over imports.
immoderation as a consequence of going beyond sufficient or permitted limits
a quantity much larger than is needed
the state of being more than full

excess (adjective)	trade surplus (adjective)
more than is needed, desired, or required