clearness vs comprehensibility

clearness and comprehensibility both are nouns.

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

As nouns, comprehensibility is a hypernym of clearness; that is, comprehensibility is a word with a broader meaning than clearness:

clearness: free from obscurity and easy to understand; the comprehensibility of clear expression
comprehensibility: the quality of comprehensible language or thought

Other hypernyms of clearness include understandability.

clearness (noun)	comprehensibility (noun)
free from obscurity and easy to understand; the comprehensibility of clear expression	the quality of comprehensible language or thought
the quality of clear water