pellucidity vs clearness

pellucidity and clearness both are nouns.

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

As nouns, pellucidity and clearness are synonyms defined as:

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

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

pellucidity (noun)	clearness (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	the quality of clear water