identical vs identicalness

identical is not a noun while identicalness is a noun.

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

identical (noun)	identicalness (noun)
	exact sameness

identical (adjective)	identicalness (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: