clearness vs lucidity

clearness and lucidity both are nouns.

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

As nouns, clearness and lucidity are synonyms defined as:

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

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

clearness (noun)	lucidity (noun)
free from obscurity and easy to understand; the comprehensibility of clear expression	free from obscurity and easy to understand; the comprehensibility of clear expression
the quality of clear water	a lucid state of mind; not confused