Mammoth Uncensored Word List:
46 - 17 letter words starting with su

subcategorization subclassification subconfigurations subjectivizations subordinatenesses subrepresentation substantialnesses substantivenesses superbillionaires supercivilization superconductivity superconglomerate superconservative supercorporations superefficiencies superfecundations superfluousnesses superheavyweights superintellectual superintelligence superintendencies superlativenesses supermillionaires superminicomputer supernaturalistic superplasticities superregenerative superromantically superromanticisms supersensualistic supersensuousness superspecializing superspectaculars superspeculations superstimulations superstitiousness superthankfulness supervigilantness supervigorousness suppressibilities suppressivenesses supranationalisms supranationalists surreptitiousness susceptiblenesses suspensefulnesses