unambiguity vs pellucidity

unambiguity and pellucidity both are nouns.

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

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

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

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

unambiguity (noun)	pellucidity (noun)
clarity achieved by the avoidance of ambiguity	passing light without diffusion or distortion
	free from obscurity and easy to understand; the comprehensibility of clear expression