sanity vs lucidity

sanity and lucidity both are nouns.

Word	Noun	Adjective	Verb	Adverb
sanity	Yes	No	No	No
lucidity	Yes	No	No	No

As nouns, lucidity is a hyponym of sanity; that is, lucidity is a word with a more specific, narrower meaning than sanity:

Other hyponyms of sanity include rationality, reason, reasonableness.

sanity (noun)	lucidity (noun)
normal or sound powers of mind	free from obscurity and easy to understand; the comprehensibility of clear expression
	a lucid state of mind; not confused