uncommon vs commonplaceness

uncommon is not a noun while commonplaceness is a noun.

Word	Noun	Adjective	Verb	Adverb
uncommon	No	Yes	No	No
commonplaceness	Yes	No	No	No

uncommon (noun)	commonplaceness (noun)
	ordinariness as a consequence of being frequent and commonplace

uncommon (adjective)	commonplaceness (adjective)
not common or ordinarily encountered; unusually great in amount or remarkable in character or kind
marked by an uncommon quality; especially superlative or extreme of its kind