capriciousness vs whimsey

capriciousness and whimsey both are nouns.

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

As nouns, capriciousness and whimsey are synonyms defined as:

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

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

capriciousness (noun)	whimsey (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