nonidentity vs distinctness

nonidentity and distinctness both are nouns.

Word	Noun	Adjective	Verb	Adverb
nonidentity	Yes	No	No	No
distinctness	Yes	No	No	No

As nouns, distinctness is a hypernym of nonidentity; that is, distinctness is a word with a broader meaning than nonidentity:

nonidentity: Difference, distinction; failure to be identical.
distinctness: the quality of being not alike; being distinct or different from that otherwise experienced or known

Other hypernyms of nonidentity include otherness, separateness.

nonidentity (noun)	distinctness (noun)
Difference, distinction; failure to be identical.	the quality of being sharp and clear
	the quality of being not alike; being distinct or different from that otherwise experienced or known
	the state of being several and distinct