different between brightness vs coruscation

English

From Middle English bryghtnes, brightnesse, from Old English beorhtnes (“brightness, splendor”), equivalent to bright +? -ness.

brightness (usually uncountable, plural brightnesses)

coruscation (countable and uncountable, plural coruscations)

A sudden display of brilliance; a flashing of light; a sparkle.
- 1837 Thomas Carlyle, The French Revolution: A History
  [I]n the dusky galleries, duskier with unwashed heads, is a strange 'coruscation,'—of impromptu billhooks.
- 2001, Oliver Sacks, Uncle Tungsten: Memories of a Chemical Boyhood, Alfred A. Knopf (2001), 6,
  All of these things - the rubbed amber, the magnets, the crystal radio, the clock dials with their tireless coruscations - gave me a sense of invisible rays and forces, a sense that beneath the familiar, visible world of colors and appearances there lay a dark, hidden world of mysterious laws and phenomena.

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