selfsameness vs identity

selfsameness and identity both are nouns.

Word	Noun	Adjective	Verb	Adverb
selfsameness	Yes	No	No	No
identity	Yes	No	No	No

As nouns, identity is a hypernym of selfsameness; that is, identity is a word with a broader meaning than selfsameness:

Other hypernyms of selfsameness include identicalness, indistinguishability.

selfsameness (noun)	identity (noun)
the quality of being identical with itself	the distinct personality of an individual regarded as a persisting entity
	exact sameness
	the individual characteristics by which a thing or person is recognized or known
	an operator that leaves unchanged the element on which it operates