Mammoth Uncensored Word List:
48 words ending with s, 22 letters long

adrenoleukodystrophies anatomicophysiologists chemolithoheterotrophs constitutionalizations counterinterpretations counterrevolutionaries craniocleidodysostosis disestablishmentarians electroencephalographs electroencephalophones encephalomyocarditises episioperineorrhaphies establishmentarianisms immunohistochemistries incomprehensiblenesses indistinguishabilities keratoconjunctivitides keratoconjunctivitises magnetostratigraphists microseismometrographs neocallimastigomycetes nonagintacentillionths octogintacentillionths otorhinolaryngologists overcommercializations overimpressionableness overindustrialisations overindustrializations overrepresentativeness philoprogenitivenesses phosphoglyceraldehydes quadragintacentillions quattuortrigintillions quinquanonagintillions quinquaoctogintillions quinquasexagintillions quinquatrigintilliards quinquavigintillionths salpingooophorectomies septentrigintillionths septuagintacentillions sexagintacentillionths tectonostratigraphists unquinquagintillionths unrepresentativenesses unviginticentillionths ureterosigmoidostomies vaginoperineorrhaphies