superciliousness vs supercilious

superciliousness is a noun but supercilious is not a noun.

Word	Noun	Adjective	Verb	Adverb
superciliousness	Yes	No	No	No
supercilious	No	Yes	No	No

superciliousness (noun)	supercilious (noun)
the trait of displaying arrogance by patronizing those considered inferior

superciliousness (adjective)	supercilious (adjective)
	having or showing arrogant superiority to and disdain of those one views as unworthy
	expressive of contempt