mischievousness vs playfulness

mischievousness and playfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
mischievousness	Yes	No	No	No
playfulness	Yes	No	No	No

As nouns, playfulness is a hypernym of mischievousness; that is, playfulness is a word with a broader meaning than mischievousness:

Other hypernyms of mischievousness include fun.

mischievousness (noun)	playfulness (noun)
reckless or malicious behavior that causes discomfort or annoyance in others	activities that are enjoyable or amusing
an attribute of mischievous children	a disposition to find (or make) causes for amusement
the trait of behaving like an imp	a festive merry feeling