same vs sameness

same is not a noun while sameness is a noun.

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

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

same (adjective)	sameness (adjective)
closely similar or comparable in kind or quality or quantity or degree
same in identity
equal in amount or value
unchanged in character or nature