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There are 252 eighteen-letter words containing E, G, H, I, O, R and Y

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lymphangiographiesmacroheterogeneitymagnesium␣hydroxidemagnetohydrostaticmagnetosphericallyMalayan␣night␣heronsmaritime␣archeologymechanographicallymetallographicallymicroheterogeneitymicrohydrogenationmonophyletic␣groupsmycobacteriophagesmy␣kingdom␣for␣a␣horseneoglyphioceratidsneuroethologicallyneuropathogenicityneurophysiologicalneurophysiologistsneuropsychobiologyneuropsychologicalneuropsychologistsNineteen␣Eighty-Fournoncholinergicallynonhyperandrogenicoligohymenophoreanoligohypomenorrheaoligoparaphenyleneoverpsychologizingoxydehydrogenationpalaeobiogeographypalaeogeochemistrypalaeohydrographicpalaeohydrologicalpalaeohydrologistspharmacogenotypingpharyngealizationspharyngoepiglotticpharyngointestinalpharyngolaryngitesphiloprogenitivelyphotoallergenicityphotodegradabilityphotographic␣memoryphysical␣geographerphysiogeographicalplay␣one's␣cards␣rightplays␣one's␣hand␣rightplethysmographicalpolygon-circle␣graphpolypharmacologiespolysporangiophyteporphyrinogenicityprephosphorylatingprolymphangiogenicprosperity␣theologyprotoporphyrinogenpsychodermatologicpsychogeographicalpsychogeriatricianpsychoneurologicalpsychoneurologistspterylographicallypyelonephritogenicPythagorean␣triplesradiometallographyradiometeorographyreality␣pornographyrenohistopathologyretrophylogenomicsrhamnosylglucosiderhamnosylglycosiderhinolaryngoscopessalpingopharyngealsalpingopharyngeusseismocardiographysemibiographicallysignature␣authoritysling␣psychrometersspectrographicallyspectroheliographysteganographicallystorage␣hypervisorsSt␣Totteringham's␣Daysuperphysiologicalsympathoadrenergicsynchronized␣divingsyringohydromyeliatelautographicallytephrostratigraphytheory␣of␣everythingthermophysiologiesthrombocytogenesisthrowaway␣ticketingtight␣pants␣syndromeTommy␣John␣surgeriestonsillopharyngealtranshydrogenation trans-hydrogenationtrimethylguanosinetypographical␣errorurethrographicallyvectorcardiographywearing␣too␣many␣hatswithin␣living␣memory

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 269 words
  • Spanish Wiktionary: 2 words
  • Italian Wiktionary: no word
  • German Wiktionary: 20 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 12 words

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