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There are 450 eighteen-letter words containing 2H, O, P, R and S

achlorophyllaceousad-hoc␣polymorphismsalphaphotographicsaminophenanthrenesamphisphaeriaceousaneurysmorrhaphiesanother␣pair␣of␣shoesanthropomorphisinganthropomorphisticanthropomorphitismanthropomorphouslyanthropophaginiansanthroposophicallyantiphosphorylatedantischizophrenicsaptahistochemistryarchaeorthopteransaspidorhynchiformsastrophotographersatmospheric␣hammersautophosphorylatedautophosphorylatesBaldwin's␣phosphorusBasque␣Shepherd␣DogsBhartrhari's␣paradoxbiophosphorescencebiophysiographicalbiphosphoglyceratebiphosphorylationsBononian␣phosphorusbrachylophosaurinsbrachymesophalangybreaches␣of␣the␣peacebroadshoulder␣physabromsulfophthaleincarbamoylphosphate carbamoyl␣phosphatecarbamoylphosphinecardiosphygmographcephalaspidomorphscephaloradiographschaphamaparvoviruschemoprophylacticschemostratigraphicchemosymbiotrophicchemotherapeutantschildren's␣hospitalschip␣on␣one's␣shoulderchlorophthalimideschlorosulpholipidscholelithotripsiescholescintigraphicchondrodystrophiaschondrodystrophieschondrodystrophoidchorioepitheliomaschronopathogenesischronostratigraphychronotherapeuticscoccolithophoridesCoppersmith's␣methodcreatine␣phosphatescritical␣philosophycry␣from␣the␣housetopcryohypophysectomycyberethnographerscyberethnographiescyberphilosophicalcystourethrographydehydrosphinganinedephosphorylationsdichlorophenarsinedihydrosphingosinedihydrothiazepinesdiphosphoglyceratediphosphohydrolasediphosphorylationsdiphyllobothriasesdiphyllobothriasisdiphyllobothriosisDoctor␣of␣Philosophydon't␣spare␣the␣horsesdystrophinopathiesechocardiographersechocardiographiesechocardiographistechoencephalogramselephants␣in␣the␣roomergasiophygophyteserythrocytopathiesesophagopharyngealethnopsychiatristseuchondrocephalansEuropean␣Shorthairsextraphilosophicalfalse␣hermaphroditefluorophosphonatesglycerolphosphatesglycerophosphataseglycerophosphatideHall-Héroult␣processHaworth␣projectionsheath␣spotted␣orchidhemiarthroplastieshemiphosphorylatedhemispermatophoreshepatosplenographyhermaphrodite␣brigshesperornithiformsheteronucleophilesheteropatriarchieshexabromobiphenylshexaphosphorylatedHippocratic␣wreathshistioneutrophilichistomorphologicalhistomorphometricshistomorphometrieshistomorphometristhistoricoprophetichistoriosophicallyHittorf's␣phosphorusholoprosencephalicHomberg's␣phosphorushomopolysaccharideHopcroft's␣algorithmhorseshoe␣up␣one's␣asshydrencephaloceleshydroastrophyllitehydrogen␣disulphidehydrophosphinationhydropolysulphideshydrostratigraphichydrosulphuric␣acidhydroxyphosphonatehydroxytryptophanshymenophoral␣tramashypercholesteremiahypercholesteremichypereosinophiliashyperlymphocytosishypermetamorphoseshypermetamorphosishyperphosphataemiahyperphosphataemichyperphosphaturiashyperphosphorylatehyperphysiologicalhypersophisticatedhypersynchronizing

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 442 words
  • Spanish Wiktionary: 2 words
  • Italian Wiktionary: no word
  • German Wiktionary: 169 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 26 words

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