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There are 656 eighteen-letter words containing A, D, H, 2O and R

(page 4)

nonmonochromatizednonpolysaccharidesNordstrandischmoornorth-northeastwardnorth-northwestwardnorthward␣equinoxesNorwegian␣Elkhoundsnot␣wrapped␣too␣tightoccupational␣hazardoctadehydrocorrinsoffset␣overhand␣bendOld␣World␣flycatcheroligodendropathiesoligosaccharidosisone␣hundred␣thousandOriental␣Orthodoxesorthopediatriciansosteochondroblastsosteochondromatousosteochondropathiaosteochondroplastyother␣days,␣other␣waysoverhead␣projectorsoverplayed␣one's␣handoxydehydrogenationoxyhydroxysulfatespachychoroidopathypachyrhizodontoidspalaeodemographiespalaeohydrogeologypalaeohydrographicpalaeohydrologicalpalaeohydrologistspalaeopropithecidspaleodemographicalparacrocodylomorphparades␣of␣horriblesparapodiapophysealparathyroid␣hormonepaved␣the␣road␣to␣hellpaves␣the␣road␣to␣hellpennies␣on␣the␣dollarpentadodecahedronsperiodontopathogenperoxodiphosphatespetro-dictatorshipsphantom␣eye␣syndromepharmacomodulationphenylboronic␣acidsphonocardiographicphosphodiesterasesphosphofluoridatesphosphoribosylatedphosphorocyanidatephosphorodiamidatephosphorodithioatephosphorothiolatedphosphorylceramidephosphosaccharidesphotobiomodulatoryphotodecolourationphotodegradabilityphotodeteriorationphotodisintegratedphotodisintegratesphotodocumentariesphotointermediatesphotoperoxidationsplastohydroquinoneplatinochloric␣acidpolydolopimorphianpolyendocrinopathypolyhydric␣alcoholspolyphosphoric␣acidpolyphosphorylatedpostbronchodilatorpotassium␣hydroxidepoured␣one's␣heart␣outpoured␣out␣one's␣heartpreached␣to␣the␣choirprocardiomyopathicprochaetodermatidsproteocephalideansprotocatechuic␣acidprotomitochondrialpseudobiographicalpseudohyponatremiapseudoisochromaticpseudomerohedrallypseudophotographicpseudophylactocarppseudopornographicpseudorhombohedralpseudorthoceratidspseudo-scholarshipspsychodermatologicput␣the␣clock␣forwardpyrophosphoramidespyrophosphoric␣acidpyrophosphorylatedquadruple␣whole␣noteraced␣out␣of␣the␣trapsradiculomyelopathyradiculoneuropathyradiculoplexopathyradiochromatogramsradiochromatographradiochromatoscansradiochronologicalradiocinematographradiohalogenationsradiohumeral␣jointsradioimmunotherapyradiometallographyradiometeorographsradiometeorographyradiomorphologicalraised␣someone's␣shagRaynaud's␣phenomenonread␣someone␣to␣filthreaped␣what␣one␣sowedresidential␣schoolsrhabdodontomorphanrhabdomyosarcomatarhamnosylglucosiderhamnosylglycosiderheofluidificationrhombicdodecahedra rhombic␣dodecahedrarhombicuboctahedrarhombidodecahedralrhombidodecahedronrhombododecahedralRichardson's␣theoremRichmond␣upon␣Thamesround-lobed␣hepaticarule␣with␣a␣rod␣of␣ironsaber-toothed␣tigerssabre-toothed␣tigerssail␣on␣another␣boardSakharov␣conditionsSaxe-Coburg␣and␣Gothaschool-dinner␣ladies school␣dinner␣ladies

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