unambiguity vs lucidness

unambiguity and lucidness both are nouns.

Word	Noun	Adjective	Verb	Adverb
unambiguity	Yes	No	No	No
lucidness	Yes	No	No	No

As nouns, lucidness is a hypernym of unambiguity; that is, lucidness is a word with a broader meaning than unambiguity:

unambiguity: clarity achieved by the avoidance of ambiguity
lucidness: free from obscurity and easy to understand; the comprehensibility of clear expression

Other hypernyms of unambiguity include clarity, clearness, limpidity, lucidity, pellucidity.

unambiguity (noun)	lucidness (noun)
clarity achieved by the avoidance of ambiguity	free from obscurity and easy to understand; the comprehensibility of clear expression