perspicuousness vs perspicuity

perspicuousness and perspicuity both are nouns.

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

As nouns, perspicuousness and perspicuity are synonyms defined as:

perspicuousness and perspicuity: clarity as a consequence of being perspicuous

Other synonyms of perspicuousness include plainness.

perspicuousness (noun)	perspicuity (noun)
clarity as a consequence of being perspicuous	clarity as a consequence of being perspicuous