clearness vs clarity

clearness and clarity both are nouns.

Word	Noun	Adjective	Verb	Adverb
clearness	Yes	No	No	No
clarity	Yes	No	No	No

As nouns, clearness and clarity are synonyms defined as:

clearness and clarity: free from obscurity and easy to understand; the comprehensibility of clear expression

Other synonyms of clearness include limpidity, lucidity, lucidness, pellucidity.

As nouns, clearness and clarity are synonyms defined as:

Other synonyms of clearness include uncloudedness.

clearness (noun)	clarity (noun)
free from obscurity and easy to understand; the comprehensibility of clear expression	the quality of clear water
the quality of clear water	free from obscurity and easy to understand; the comprehensibility of clear expression