Mammoth Uncensored Word List:
65 - 13 letter words starting with fr

fractionalise fractionalism fractionalist fractionalize fractionating fractionation fractionators fractionising fractionizing fractiousness fractocumulus fractostratus fractureproof fragilenesses fragmentarily fragmentating fragmentation fragmentising fragmentizing franchisement francophobias francophobics frangibleness frankalmoigns frankincenses franticnesses fraternalisms fraudulencies freebooteries freeheartedly freemasonries freethinkings freewheelings freightliners frenuloplasty frequentation frequentative freshmanships fretfulnesses friablenesses frighteningly frightfulness fringilliform frivolousness frizzlinesses frondescences frontbenchers frontispieced frontispieces frontogeneses frontogenesis frontogenetic frontopontine frontrunnings frostproofers frostproofing frowardnesses frowstinesses fructuousness fruitarianism fruitlessness frumentaceous frumentarious frumentations frustratingly