capriciousness vs changefulness

capriciousness and changefulness both are nouns.

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

As nouns, changefulness is a hypernym of capriciousness; that is, changefulness is a word with a broader meaning than capriciousness:

capriciousness: the quality of being guided by sudden unpredictable impulses
changefulness: the quality of being changeable and variable

Other hypernyms of capriciousness include inconstancy.

capriciousness (noun)	changefulness (noun)
the trait of acting unpredictably and more from whim or caprice than from reason or judgment	the quality of being changeable and variable
the quality of being guided by sudden unpredictable impulses