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There are 90 eighteen-letter words containing 2H, M, P, S and Y

ad-hoc␣polymorphismsaneurysmorrhaphiesanthropomorphouslyaptahistochemistryaspidorhynchiformsbiophysicochemical bio-physico-chemicalbrachymesophalangycarbamoylphosphate carbamoyl␣phosphatecarbamoylphosphinecardiosphygmographchemoprophylacticschemosymbiotrophicChimpy␣McFlightsuitcry␣from␣the␣housetopcryohypophysectomydimethyldisulphidedimethylsulphoxide dimethyl␣sulphoxideentomophytophagoushemiphosphorylatedhexabromobiphenylshomopolysaccharidehymenophoral␣tramashyperbaric␣chambershypercholesteremiahypercholesteremichyperlymphocytosishypermetamorphoseshypermetamorphosishyperphosphataemiahyperphosphataemichyperthyroxinemiashypocholesteraemiahypoparathyroidismhypophosphataemiashypophosphatasemiahypophysectomizinghypothalamectomiesichthyosauromorphslymphangiographieslymphocytapheresislymphoepitheliomaslymphohematogenouslymphohistocytosislymphoscintigraphymacrophanerophytesmethoxytryptophansmethylamphetaminesmethylenediphenolsmethylnaphthalenesmicrophanerophytesmonophosphorylatedmorphostratigraphyOmphalos␣hypothesisphaeochromocytomaspharmacophenotypespharmacophysiologypharmacopsychiatryphosphorylceramidephotoplethysmogramphysicochemicalismphysicomathematicsphysiobiochemistryphytomorphologistsphytophysiognomiesplay␣with␣house␣moneyplethysmographicalpolychemotherapiespolychromatophilespolyplethysmographpsychopharmaceuticpsychopharmacologypsychrometric␣chartpyrophosphoramidesrheoplethysmographsodium␣hypochloriteSteeple␣with␣Tynehamsympathochromaffinsympathoinhibitionsympathoinhibitorssympathoinhibitorysymphony␣orchestrasthermophysiologiesthrombelastographythrombocytopathiesthromboprophylaxesthromboprophylaxistrimethylphosphine

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 39 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 12 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 1 word

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