13 letters · 22 points in Scrabble
originInternational word formed circa 1950 from Ancient Greek δώδεκα (dṓdeka, “twelve”) + φωνή (phōnḗ, “sound”) + -ist, recorded in English since 1953, presumably modeled on German Dodekaphonist.
Etymology from Wiktionary, CC BY-SA 3.0