impishness vs mischievousness

impishness and mischievousness both are nouns.

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

As nouns, impishness and mischievousness are synonyms defined as:

Other synonyms of impishness include puckishness, whimsicality.

impishness (noun)	mischievousness (noun)
the trait of behaving like an imp	reckless or malicious behavior that causes discomfort or annoyance in others
	an attribute of mischievous children
	the trait of behaving like an imp