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There are 203 eighteen-letter words containing 2H, M, O and Y

ad-hoc␣polymorphismsalphacetylmethadolaneurysmorrhaphiesanthropomorphologyanthropomorphouslyantiarrhythmogenicapophthegmaticallyaptahistochemistryaspidorhynchiformsbatrachomyomachianbatrachomyomachiesBeals-Hecht␣syndromebiophysicochemical bio-physico-chemicalbrachymesophalangybronchopneumopathycarbamoylphosphate carbamoyl␣phosphatecarbamoylphosphinecardiosphygmographchemoimmunotherapychemoprophylacticschemosymbiotrophicchemosyntheticallychloroethoxyamineschloromethylationschloropyromorphiteChomsky␣hierarchieschondromesenchymalchromoanasynthesischronochemotherapychronopharmacologycry␣from␣the␣housetopcryohypophysectomycytohistochemistrydiethylaminomethyldihydromethysticindimethylsulphoxide dimethyl␣sulphoxidedimethylxanthenonedysrhythmogenicityecohydrogeomorphicencephalomyopathicentomophytophagouserythroenzymopathyethoxymethylidenesfluoroethoxymethylglamour␣photographyhammerhead␣ribozymeheavy␣marching␣orderhelminthologicallyhemihydrochlorideshemiphosphorylatedhepatonephromegalyhermaphroditicallyhexabromobiphenylshexadecyloxymethylhistocytochemistryhomochlorcyclizinehomopolysaccharidehow␣much␣do␣you␣chargehydroflumethiazidehydrogeochemicallyhydrogeomorphologyhydromorphologicalhydroxyamphetaminehydroxymethylationhymenophoral␣tramashypercholesteremiahypercholesteremichyperlymphocytosishypermetamorphoseshypermetamorphosishypermetamorphotichypermethioninemiahyperornithinaemiahyperphosphataemiahyperphosphataemichyperthrombinaemiahyperthyroxinaemiahyperthyroxinaemichyperthyroxinemiashypidiomorphicallyhypocholesteraemiahypohemoglobinemiahypoparathyroidismhypophosphataemiashypophosphatasemiahypophysectomizinghypothalamectomiesichthyohaemotoxinsichthyosarcotoxismichthyosauromorphsimmunochemotherapyLesch-Nyhan␣syndromelithium␣borohydridelymphangiographieslymphocytapheresislymphoepitheliomaslymphohematogenouslymphohistocytosislymphoscintigraphymacropetalichthyidmacrophanerophytesmake␣heavy␣weather␣ofMalayan␣night␣heronsmechanographicallymethoxyamphetaminemethoxycyclohexenemethoxyeleutherinsmethoxynaphthalenemethoxytryptophansmethylcholanthrenemethylcyclohexanesmethylcyclohexanolmethylenediphenolsmethyllanthioninesmethylmethaqualonemethylotrophicallymicrobrachytherapymicrophanerophytesmonochlorobiphenylmonohydrochloridesmonohydroxymethanemonophosphorylatedmorphophonemicallymorphostratigraphynanochromatographyneuroophthalmology neuro-ophthalmologynon-Hodgkin␣lymphomanymph␣of␣the␣pavementoligohymenophoreanoligohypomenorrheaOmphalos␣hypothesisophthalmologicallyophthalmopathologyophthalmotonometryorthopantomographyparathyroid␣hormonephaeochromocytomasphaerochromocytomapharmacophenotypespharmacophoricallypharmacophysiologypharmacopsychiatryphenyldiazomethanephenylethanolaminepheochromocytomataPhilippine␣mahoganyphosphorylceramidephotogeomorphologyphotographic␣memory

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 59 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 15 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 1 word

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