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There are 738 eighteen-letter words containing H, I, 2O and 2S

(page 3)

hydrofluosilicateshydrolaparoscopieshydromagnesiationshydropolysulphideshydrostatic␣bellowshydrosulfite␣of␣sodahydrosulfurous␣acidhydrotechnologistshydroxyperoxidaseshymenopterologistshyperaldosteronismhypercompensationshypercondensationshyperconscientioushyperconsciousnesshypereosinophiliashyperlymphocytosishypermetamorphosishypermucoviscosityhyperoestrogenismshyperpolarisationshypersomatotropismhypoaldosteronismshypochondrogenesishypochondroplasiashypogranulocytosishypomyelinogenesishypophosphataemiashypophosphatasemiahyporesponsivenesshyposensitisationshyposensitizationshyposuccinylationshyposulphite␣of␣sodahyposulphurous␣acidhypsiprymnodontidsichthyosarcotoxinsichthyosarcotoxismichthyosauromorphsicosidodecahedronsimmunopathogenesesimmunopathogenesisimmunopathologistsIndian␣rhinocerosesinner␣automorphismsin-school␣suspensionintermetamorphosisisoelectrophoresisisomaltosaccharideisopropylethylenesisopropylphosphateJosephson␣junctionskinesthesiologistsking␣oyster␣mushroomKingston␣upon␣Thameskissing␣someone's␣hemKitti's␣hog-nosed␣batsknights␣of␣the␣spigotKosaraju's␣algorithmlarge␣tortoiseshelllasiosphaeriaceousleptosphaeriaceouslie␣at␣someone's␣heartlight␣someone's␣ass␣uplipophosphoglycanslives␣in␣the␣shadow␣oflongnose␣lancetfishloose␣lips␣sink␣shipslophiostomataceouslowering␣one's␣sightslymphangiosarcomaslymphohistocytosislysophosphatidateslysophospholipaseslysosphingomyelinsMansfield␣Woodhousemaster␣of␣the␣obviousmesopolysaccharidemetachondromatosismetschnikowiaceousmicrocosmographiesmicrohistoculturesmicroiontophoresismicromechanosensormicrotechnologistsmicrowhip␣scorpionsminor␣seventh␣chordsMissouri␣toothpicksmissynchronizationmonophosphokinasesmonothiophosphatesmonstrous␣moonshinemore␣sacks␣on␣the␣millmore␣sacks␣to␣the␣millmorphophonologistsMother␣of␣Presidentsmoving␣the␣goalposts moving␣the␣goal␣postsmutton-chop␣whiskersnail-polish␣removers nail␣polish␣removersnarcodictatorshipsNational␣BolsheviksNational␣Bolshevismnatural␣isomorphismneoatherosclerosisneoichthyosauriansnephropathogenesisnephropathologistsneurocristopathiesneurolymphomatosisneuromorphogenesisneurophysiologistsneuropsychologistsneuropsychopathiesneutrophilopoiesisnights␣of␣long␣knives Nights␣of␣Long␣KnivesnonaccomplishmentsnonanthropologistsnonphosphopeptidesnonpolysaccharidesnonrheumatologistsnonsadomasochisticNordstrandischmoorNorth␣Ossetia-Alaniano␣skin␣off␣one's␣teethnotch␣in␣one's␣bedpostnucleopolyhedrosisoesophagostomiasisOld␣English␣SheepdogoldfieldthomasiidsoligochaetologistsoligosaccharidosisOmphalos␣hypothesisoperations␣researchopisthobranchiatesopposition␣researchopsonophagocytosisorganisation␣chartsOriental␣Shorthairsorthogonalisationsorthopedic␣surgeons

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