identicalness vs sameness

identicalness and sameness both are nouns.

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

As nouns, sameness is a hypernym of identicalness; that is, sameness is a word with a broader meaning than identicalness:

identicalness (noun)	sameness (noun)
exact sameness	the quality of being alike
	the quality of wearisome constancy, routine, and lack of variety