capriciousness vs whimsy

capriciousness and whimsy both are nouns.

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

As nouns, capriciousness and whimsy are synonyms defined as:

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

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

capriciousness (noun)	whimsy (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	an odd or fanciful or capricious idea