arbitrariness vs capriciousness

arbitrariness and capriciousness both are nouns.

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

As nouns, arbitrariness and capriciousness are synonyms defined as:

arbitrariness and capriciousness: the trait of acting unpredictably and more from whim or caprice than from reason or judgment

Other synonyms of arbitrariness include flightiness, whimsey, whimsicality, whimsy.

arbitrariness (noun)	capriciousness (noun)
the trait of acting unpredictably and more from whim or caprice than from reason or judgment	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