arbitrariness vs whimsicality

arbitrariness and whimsicality both are nouns.

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

As nouns, arbitrariness and whimsicality are synonyms defined as:

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

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

arbitrariness (noun)	whimsicality (noun)
the trait of acting unpredictably and more from whim or caprice than from reason or judgment	the trait of behaving like an imp
	the trait of acting unpredictably and more from whim or caprice than from reason or judgment