different between effulgence vs clearness

English

From Latin ex- (“out of, from”) and fulgere (“to shine”).

effulgence (countable and uncountable, plural effulgences)

A state of being bright and radiant, splendor, brilliance.
- 1875, Henry James, Roderick Hudson, New York Edition 1909, hardcover, page 457
  He stood for a moment taking in the effulgence.

From clear +? -ness

clearness (usually uncountable, plural clearnesses)

(obsolete) Brightness, brilliancy. [14^th-17^thc.]
Mental or sensory distinctness; clarity of understanding, perception etc. [from 16^thc.]
- 1966, "The Lowest Depths", Time, 6 September:
  The daily press is the evil principle of the modern world, and time will only serve to disclose this fact with greater and greater clearness.
The state of being free from obscurities or opacity; distinctness of light, colour etc. [from 17^thc.]
The clearness of the water meant I could still see the key lying on the river-bed.
The state of being free from obstruction or interference. [from 17^thc.]
The clearness of the path made for an easy hike.

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