lucidity vs lucidness

lucidity and lucidness both are nouns.

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

As nouns, lucidity and lucidness are synonyms defined as:

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

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

lucidity (noun)	lucidness (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
a lucid state of mind; not confused