11 letters · 18 points in Scrabble
noun strained or paradoxical use of words either in error (as `blatant' to mean `flagrant') or deliberately (as in a mixed metaphor: `blind mouths')
originLearned borrowing from Latin catachrēsis, borrowed from Ancient Greek κατάχρησις (katákhrēsis, “misuse (of a word)”).
Etymology from Wiktionary, CC BY-SA 3.0