different between clearness vs intelligibility

English

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.

intelligibility (usually uncountable, plural intelligibilities)

(degree of being intelligible): clearness, explicitness, lucidity, comprehensibility, perspicuity, legibility, plain speaking.

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