niceness vs polite

niceness is a noun but polite is not a noun.

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

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

niceness (adjective)	polite (adjective)
	showing regard for others in manners, speech, behavior, etc.
	not rude; marked by satisfactory (or especially minimal) adherence to social usages and sufficient but not noteworthy consideration for others
	marked by refinement in taste and manners