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There are 977 eighteen-letter words containing H, 3O and S

(page 5)

orthosubstitutionsostarioclupeomorphosteoarchaeologistosteoarcheologicalosteoarcheologistsosteoarthrectomiesosteoarthropathiesosteochemonecrosisosteochondroblastsosteochondromatousosteochondropathiaosteochondrophytesosteochondroplastyosteomorphologicalOstrogothic␣Kingdomother␣side␣of␣the␣coinouter␣automorphismsout␣of␣someone's␣handsovariohysterectomyoverhead␣projectorsoverpsychologizingoversophisticationoxazaphospholidineoxazolidinethionespachyrhizodontoidspaedopsychologicalpaedopsychologistspalaeoethnologistspalaeohistologicalpalaeohydrologistspalaeopathologistspalaeornithologistpaleoethnobotanistpaleoherpetologistpaleoichthyologistpaleophysiologicalpaleopsychologicalpaleornithologistspathomorphogenesispathophysiologicalpathophysiologistspathopsychologicalpentachloroanisolepentachlorophenolsperoxodiphosphatesphaeochromocytomasphallologocentrismpharmacoeconomistspharmacophysiologypharmacoproteomicsphilosophers␣of␣firephilosopher's␣stones philosophers'␣stonesphilosophies␣of␣mindphloroglucinolysisphonomicrosurgicalphosphoacetylationphosphocholinationphosphodestructionphosphofluoridatesphosphoglucokinasephosphoglucomutasephosphoglucosaminephosphoglycolipidsphosphohexomutasesphosphoisoprenoidsphospholipomannansphospholipoproteinphosphomannomutasephosphometabolitesphosphometabolomicphosphomevalonatesphosphoneoepitopesphosphonodiamiditephosphonodithioatephosphonoglycerolsphosphonopentanoicphosphonopyruvatesphosphonoselenoatephosphonucleosidesphosphonucleotidesphosphopentomutasephosphorecognitionphosphoribomutasesphosphoriboproteinphosphoribosylatedphosphorocyanidatephosphorodiamidatephosphorodithioatephosphorothioationphosphorothiolatedphosphorothiolatesphosphorrössleritephosphorus␣necrosisphosphorylcholinesphotoassimilationsphotochemical␣smogsphotochlorinationsphotoconceptualismphotoconceptualistphotoconsistenciesphotocrosslinkablephotocrosslinkingsphotodecompositionphotodensitometersphotodensitometricphotodissociationsphotodocumentariesphotoelectrographsphotoencapsulationphotoendosomolysisphotoendosomolyticphotoendosymbiontsphotofermentationsphotoinactivationsphotoisomerisationphotoisomerizationphotokeratectomiesphotolithographersphotomicrographersphotomorphogenesisphotonephelometersphoto␣opportunitiesphotoperiodicitiesphotoperoxidationsphotoperturbationsphotophosphorylasephotophysiologicalphotoplethysmogramphotoregenerationsphotoreproductionsphotorespirometersphotosensitisationphotosensitizationphotospectrometersphotospectrometricphotospectroscopicphotostabilizationphotosterilizationphotosubstitutionsphotothermoplasticphototransformablephysicotheologicalphysiopathologicalphysiopathologistsphytomorphologistsphytophysiognomiesphytophysiologicalphytoplanktivorousPinocchio␣illusionsplastohydroquinonepleurolophocercouspolished␣one's␣rocketpolishes␣one's␣rocket

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