pellucidity vs lucidness

pellucidity and lucidness both are nouns.

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

As nouns, pellucidity and lucidness are synonyms defined as:

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

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

pellucidity (noun)	lucidness (noun)
passing light without diffusion or distortion	free from obscurity and easy to understand; the comprehensibility of clear expression
free from obscurity and easy to understand; the comprehensibility of clear expression