flightiness vs arbitrariness

flightiness and arbitrariness both are nouns.

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

As nouns, flightiness and arbitrariness are synonyms defined as:

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

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

flightiness (noun)	arbitrariness (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