11 letters · 15 points in Scrabble
noun an event in which one thing is substituted for another
noun the act of changing the arrangement of a given number of elements
noun complete change in character or condition; - Henry Miller
originFrom Middle English permutacioun, permutacyoun, from Old French permutacïon, promutatïon and Medieval Latin permūtātiōnem, accusative of permūtātiō. Morphologically permute + -ation.
Etymology from Wiktionary, CC BY-SA 3.0