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There are 660 eighteen-letter words containing H, 2O, R and 2S

(page 3)

hypereosinophiliashyperlymphocytosishypermetamorphoseshypermetamorphosishypermonosyllableshypermucoviscosityhyperoestrogenismshyperpolarisationshypersomatotropismhypoaldosteronismshypochondrogenesishypochondroplasiashypogranulocytosishyporesponsivenesshyposulphurous␣acidhypsiprymnodontidsichthyosarcotoxinsichthyosarcotoxismichthyosauromorphsicosidodecahedronsIndian␣rhinocerosesinner␣automorphismsintermetamorphosisisoelectrophoresisisomaltosaccharideisopropylethylenesisopropylphosphateking␣oyster␣mushroomkleptochloroplastsknow␣where␣one␣standsKosaraju's␣algorithmlarge␣tortoiseshelllasiosphaeriaceousleptosphaeriaceouslie␣at␣someone's␣heartlowering␣one's␣sightslymphangiosarcomasmajor␣seventh␣chordsmaster␣of␣the␣obviousmaster␣of␣the␣schoolsmesopolysaccharidemetachondromatosismethyltestosteronemicrocosmographiesmicrohistoculturesmicroiontophoresismicromechanosensormicrotechnologistsmicrowhip␣scorpionsminor␣seventh␣chordsMissouri␣toothpicksmissynchronizationmodular␣smartphonesmonstrous␣moonshinemore␣sacks␣on␣the␣millmore␣sacks␣to␣the␣millmorphophonologistsMother␣of␣PresidentsMount␣Rushmore␣Statemouthfuls␣of␣marblesmucopolysaccharasemutton-chop␣whiskersnail-polish␣removers nail␣polish␣removersnarcodictatorshipsnasopharyngoscopesnatural␣isomorphismneoatherosclerosisneoichthyosauriansnephropathogenesisnephropathologistsneurocristopathiesneurolymphomatosisneuromorphogenesisneurophysiologistsneuropsychologistsneuropsychopathiesneutrophilopoiesisnonanthropologistsnonpolysaccharidesnonrheumatologistsNordstrandischmoorNorth␣Ossetia-Alanianucleopolyhedrosisoligosaccharidosisoperations␣researchopisthobranchiatesopposition␣researchorange␣sharpshooterorganisation␣chartsorganophosphatasesorganophosphonatesOriental␣Shorthairsorthogonalisationsorthopedic␣surgeonsorthophasmavirusesorthopneumovirusesorthopsychiatristsorthorubulavirusesorthosubstitutionsosteoarchaeologistosteoarcheologistsosteoarthrectomiesosteoarthropathiesosteochemonecrosisosteochondroblastsosteochondromatousosteochondrophytesosteochondroplastyostrich␣instructionother␣days,␣other␣waysouter␣automorphismsoversophisticationoverthoughtfulnessoxygen␣catastrophesoxyhydroxysulfatespalaeohydrologistspaleornithologistsparades␣of␣horriblespathomorphogenesisperoxodiphosphatesPeterson's␣algorithmpetro-dictatorshipsphaeosphaeriaceouspharmacoeconomistspharyngotonsilitisphilosophers␣by␣firephilosophers␣of␣firephilosopher's␣stones philosophers'␣stonesphloroglucinolysisphosphodestructionphosphodiesterasesphosphofluoridatesphosphoisoprenoidsphosphonoglycerolsphosphonopyruvatesphosphoribomutasesphosphoribosylatedphosphorothiolatesphosphorssleritephosphorus␣cachexiaphosphorus␣necrosisphosphorylcholinesphosphosaccharidesphosphotransferase

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