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There are 725 eighteen-letter words containing H, I, O, R, S and Y

(page 5)

rhamnosylglucosiderhamnosylglycosiderhinolaryngoscopesrides␣the␣cotton␣ponyrosebay␣willowherbsroyal␣straight␣flushsaccopharyngiformsSaint␣Anthony's␣crosssalpingopharyngealsalpingopharyngeusscheduled␣territorySchnitzler␣syndromescimitar-horned␣oryxsecondary␣phosphineseismocardiographysemibiographicallyshoving␣it␣up␣your␣assSiberian␣rubythroatsigillographicallysignature␣authoritysling␣psychrometerssocial␣anthropologysociochronobiologysodium␣borohydridessodium␣hypochloritesonosalpingographysouthern␣yellow␣pinespectrographicallyspectroheliographyspirocycloheptanessplanchnocraniallyspondylarthritidesspondyloperipheralspondylotherapistsstakeholder␣societystatutory␣authoritysteganographicallystephanoberyciformsticky␣shed␣syndromestoichiometricallystorage␣hypervisorsstrontiopyrochloreSt␣Totteringham's␣Daystyrylisothiazolessublogarithmicallysulfonic␣anhydridessulphonic␣anhydridesuperoleophobicitysuperphenomenalitysuperphysiologicalsuperstoichiometrysupraphysiologicalsympathetic␣powderssympathoadrenergicsympathochromaffinsympathoexcitatorysympathoinhibitorssympathoinhibitorysymplectomorphismssynchiotrophoblastsynchronized␣clockssynchronized␣diverssynchronized␣divingsynctiotrophoblastsyringohydromyeliaTaylor-White␣processtephrostratigraphytertiary␣phosphinestetrahydrocortisoltheoretical␣physicsthermoacoustimetrythermodynamic␣statethermophysiologiesthermoresponsivitythiophosphorylatedthiopyrophosphatesthree-dimensionallythrombocytogenesisthrombocytopaeniasthrombocytopathiesthrombocytopoiesisthromboprophylaxistight␣pants␣syndrometitan␣primary␣schoolTommy␣John␣surgeriestonsillopharyngealTorne␣Valley␣Finnishtoxic␣shock␣syndrometransendotheliallytranshydrogenation trans-hydrogenationtransphenomenalitytranstheoreticallyTransylvanian␣Houndtrash␣heap␣of␣historytrialkylphosphinestrichlorobiphenylstrichlorodiphenylstrichloroethylenestrichostrongyloidstrichostrongylosistricresyl␣phosphatetrihexosylceramidetrihydroxybenzenestrihydroxystilbenetrimethylammoniumstrimethylguanosinetrimethylphosphinetrimethylsulfoniumtriphenylphosphanetriphenylphosphatetriphenylphosphinetriphosphorylationtrivinylphosphinestryptophylquinonesunitary␣authoritiesureterolithotripsyurethrocystoscopicveterinary␣hospitalwave␣the␣bloody␣shirtwearing␣too␣many␣hatswhisky␣tango␣foxtrotwhite␣carbohydrateswithdrawal␣symptomsxylopolysaccharideYear␣Without␣a␣Summeryou␣can't␣polish␣a␣turdYour␣Worshipfulnessyouth␣organizations

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 811 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 78 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 27 words

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