different between superabundance vs surplusage

English

super- +? abundance

superabundance (usually uncountable, plural superabundances)

An extreme abundance; abundance to a vast degree that seems almost excessive.
We have not merely an abundance, but a superabundance of enemies at this time; they will need to stand in line to disagree with us.

From Medieval Latin surplusagium, from surplus.

surplusage (countable and uncountable, plural surplusages)

(now rare) A surplus; a superabundance.
- 1590, Edmund Spenser, The Faerie Queene, II.vii:
  If then thee list my offred grace to vse, / Take what thou please of all this surplusage; / If thee list not, leaue haue thou to refuse […]
- 1841, Ralph Waldo Emerson, Compensation
  A surplusage given to one part is paid out of a reduction from another part of the same creature.
(law) Matter in pleading which is not necessary or relevant to the case, and may be rejected.
(finance) A greater disbursement than the charge of the accountant amounts to.
- 1802–1819, Abraham Rees, The Cyclopædia; or, Universal Dictionary of Arts, Sciences, and Literature
  one third-part of the surplusage of the estate of any person dying inte?tate, ?hall be distributed to his widow,and the re?idue among?t his children by equal portions

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