surplusage vs excess

surplusage and excess both are nouns.

Word	Noun	Adjective	Verb	Adverb
surplusage	Yes	No	No	No
excess	Yes	Yes	No	No

As nouns, surplusage and excess are synonyms defined as:

Other synonyms of surplusage include nimiety, surplus.

surplusage (noun)	excess (noun)
a quantity much larger than is needed	excessive indulgence
	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

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