PRONUNCIATION:(kat-uh-KREE-sis) The misuse of words.
Here's a catchall word for all those mixed metaphors, malapropisms, and bushisms. It derives via Latin from Greek katakhresthai (to misuse).
noun: A slip of the tongue (or pen) that reveals the unconscious mind.
Parapraxis is a fancy word for the Freudian slip. It's derived from Greek para- (beside, beyond) + praxis (act).
--both via A.Word.A.Day (wordsmith.org).