mischievousness vs devilment

mischievousness and devilment both are nouns.

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

As nouns, mischievousness and devilment are synonyms defined as:

mischievousness and devilment: reckless or malicious behavior that causes discomfort or annoyance in others

Other synonyms of mischievousness include devilry, deviltry, mischief-making, mischief, rascality, roguery, roguishness, shenanigan.

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