Mammoth Uncensored Word List:
19 - 14 letter words starting with sl

slanderousness slantendicular slantindicular slatternliness slaughterhouse slaughterously sledgehammered slipperinesses slipshoddiness slipshodnesses slobbishnesses slockingstones slothfulnesses slovenlinesses sluggardliness sluggardnesses sluggishnesses slumberousness sluttishnesses