capriciousness vs flightiness

capriciousness and flightiness both are nouns.

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

As nouns, capriciousness and flightiness are synonyms defined as:

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

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

capriciousness (noun)	flightiness (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