clearness vs pellucidity

clearness and pellucidity both are nouns.

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

As nouns, clearness and pellucidity are synonyms defined as:

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

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

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