malaprop vs misstatement

malaprop and misstatement both are nouns.

Word	Noun	Adjective	Verb	Adverb
malaprop	Yes	No	No	No
misstatement	Yes	No	No	No

As nouns, misstatement is a hypernym of malaprop; that is, misstatement is a word with a broader meaning than malaprop:

malaprop: the unintentional misuse of a word by confusion with one that sounds similar
misstatement: a statement that contains a mistake

malaprop (noun)	misstatement (noun)
the unintentional misuse of a word by confusion with one that sounds similar	a statement that contains a mistake