capricious vs capriciousness

capricious is not a noun while capriciousness is a noun.

Word	Noun	Adjective	Verb	Adverb
capricious	No	Yes	No	No
capriciousness	Yes	No	No	No

capricious (noun)	capriciousness (noun)
	the trait of acting unpredictably and more from whim or caprice than from reason or judgment
	the quality of being guided by sudden unpredictable impulses

capricious (adjective)	capriciousness (adjective)
determined by chance or impulse or whim rather than by necessity or reason
changeable