nice vs niceness

nice is not a noun while niceness is a noun.

Word	Noun	Adjective	Verb	Adverb
nice	No	Yes	No	No
niceness	Yes	No	No	No

nice (noun)	niceness (noun)
	the quality of nice
	the quality of being difficult to detect or analyze
	a courteous manner that respects accepted social usage

nice (adjective)	niceness (adjective)
pleasant or pleasing or agreeable in nature or appearance
excessively fastidious and easily disgusted
exhibiting courtesy and politeness
socially or conventionally correct; refined or virtuous
done with delicacy and skill