Mammoth Uncensored Word List:
22 - 13 letter words starting with lo

loathednesses loathlinesses loathsomeness localisations localizations locksmithings lockstitching logarithmical logicalnesses logodaedalies logogrammatic logographical lollapaloozas longanimities longinquities longsuffering losablenesses loutishnesses lovablenesses loveabilities lowerclassman lowerclassmen