Mammoth Uncensored Word List:
65 - 17 letter words starting with r

radioastronomical radioautographies radiobiologically radiobroadcasters radiobroadcasting radiochromatogram radioimmunoassays radioimmunoguided radioisotopically radioluminescence radiopasteurizing radiotelegraphies rationalistically recapitalisations recapitalizations recentralizations rechromatographed reclassifications recognizabilities reconceptualizing reconcilabilities reconstructionism reconstructionist recontextualizing recrystallisation recrystallization redistributionist rediversification refrangiblenesses rehospitalization reincarnationists reindustrializing reinterpretations rememberabilities remilitarizations remorselessnesses renationalization repersonalization repetitiousnesses reprehensibleness reproachfulnesses reproducibilities resolidifications resourcefulnesses respectablenesses responsiblenesses restrictivenesses resynchronisation resynchronization retransformations retransplantation retraumatizations retroperitoneally retroreflectivity revascularisation revascularization revolutionariness rhabdomyosarcomas rhinolaryngoscope rhynchocephalians ribonucleoprotein roentgenographies roundheadednesses rudimentarinesses rumbustiousnesses