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There are 165 eighteen-letter words containing 2H, I, M and Y

ad-hoc␣polymorphismsamphitheatricalityaneurysmorrhaphiesantiarrhythmogenicapophthegmaticallyaptahistochemistryaspidorhynchiformsbatrachomyomachianbatrachomyomachiesbiophysicochemical bio-physico-chemicalcarbamoylphosphinecardiosphygmographchemoimmunotherapychemoprophylacticschemosymbiotrophicchemosyntheticallyChimpy␣McFlightsuitchloroethoxyamineschloromethylationschloropyromorphiteChomsky␣hierarchieschromoanasynthesiscytohistochemistrydexmethylphenidatediethylaminomethyldiethylthiambutenedihydromethysticindimethylanthracenedimethyldisulphidedimethylhydrazinesdimethylsulphoxide dimethyl␣sulphoxidedimethylxanthenonedysrhythmogenicityEarly␣New␣High␣Germanecohydrogeomorphicencephalomyopathicethoxymethylidenesgee␣haw␣whammy␣diddlegee␣haw␣whimmy␣diddlehammerhead␣ribozymeHartwith␣cum␣WinsleyHarvey␣Smith␣salutesheavy␣marching␣orderhelminthologicallyhemihydrochlorideshemimegalencephalyhemiphosphorylatedhermaphroditicallyhexabromobiphenylshexamethyldisilanehistocytochemistryhomochlorcyclizinehomopolysaccharidehydroflumethiazidehydrogeochemicallyhydromorphologicalhydroxyamphetaminehydroxymethylationhyperbaric␣chambershypercholesteremiahypercholesteremichyperlymphocytosishypermetamorphosishypermetamorphotichypermethioninemiahyperornithinaemiahyperphosphataemiahyperphosphataemichyperthrombinaemiahyperthyroxinaemiahyperthyroxinaemichyperthyroxinemiashypidiomorphicallyhypocholesteraemiahypohemoglobinemiahypoparathyroidismhypophosphataemiashypophosphatasemiahypophysectomizinghypothalamectomiesichthyohaemotoxinsichthyosarcotoxismichthyosauromorphsimmunochemotherapylithium␣borohydridelymphangiographieslymphocytapheresislymphoepitheliomaslymphohistocytosislymphoscintigraphymacropetalichthyidMalayan␣night␣heronsmarrying␣the␣ketchupmechanographicallymethoxyamphetaminemethoxyeleutherinsmethylamphetaminesmethylenediphenolsmethyllanthioninesmethylotrophicallymicrobrachytherapymicrophanerophytesmonochlorobiphenylmonohydrochloridesmorphophonemicallymorphostratigraphynon-Hodgkin␣lymphomaoligohymenophoreanoligohypomenorrheaOmphalos␣hypothesisophthalmologicallyparathyroid␣hormonepharmacophoricallypharmacophysiologypharmacopsychiatryphenyldiazomethanephenylethanolaminePhilippine␣mahoganyphosphorylceramidephotographic␣memoryphotoimmunotherapyphysicochemicalismphysicomathematicsphysiobiochemistryphytohemagglutininphytohemaglutininephytomorphologicalphytomorphologistsphytopharmacologicphytophysiognomiesplay␣with␣house␣moneyplethysmographicalpolychemotherapiespolychromatophilespolychromatophiliapolychromatophilicprimary␣hypothermiapsychopharmaceuticpsychrometric␣chartpyrophosphoramidesretinohypothalamicrhythmic␣gymnasticsright␣lymphatic␣ductsodium␣hypochloriteSteeple␣with␣Tynehamsympathochromaffinsympathoinhibitionsympathoinhibitorssympathoinhibitorytetramethylthiuram

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 50 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 22 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 5 words

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