identical vs identity

identical is not a noun while identity is a noun.

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

identical (noun)	identity (noun)
	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

identical (adjective)	identity (adjective)
(of twins) derived from a single egg or ovum
coinciding exactly when superimposed
having properties with uniform values along all axes
exactly alike; incapable of being perceived as different
being the exact same one; not any other: