Mammoth Uncensored Word List:
16 words ending with ed, 18 letters long

cholecystectomized chromolithographed constitutionalized dehydrochlorinated hypersophisticated immunoprecipitated nondimensionalised nondimensionalized overcommercialized overindustrialized overprocrastinated overproportionated photodisintegrated strawberryflavored supersophisticated ultrasophisticated