infantilism vs misbehaviour

infantilism and misbehaviour both are nouns.

Word	Noun	Adjective	Verb	Adverb
infantilism	Yes	No	No	No
misbehaviour	Yes	No	No	No

As nouns, misbehaviour is a hypernym of infantilism; that is, misbehaviour is a word with a broader meaning than infantilism:

Other hypernyms of infantilism include misbehavior, misdeed.

infantilism (noun)	misbehaviour (noun)
infantile behavior in mature persons	improper or wicked or immoral behavior
an abnormal condition in which an older child or adult retains infantile characteristics