perspicuousness vs clarity

perspicuousness and clarity both are nouns.

Word	Noun	Adjective	Verb	Adverb
perspicuousness	Yes	No	No	No
clarity	Yes	No	No	No

As nouns, clarity is a hypernym of perspicuousness; that is, clarity is a word with a broader meaning than perspicuousness:

perspicuousness: clarity as a consequence of being perspicuous
clarity: free from obscurity and easy to understand; the comprehensibility of clear expression

Other hypernyms of perspicuousness include clearness, limpidity, lucidity, lucidness, pellucidity.

perspicuousness (noun)	clarity (noun)
clarity as a consequence of being perspicuous	the quality of clear water
	free from obscurity and easy to understand; the comprehensibility of clear expression