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There are 847 eighteen-letter words containing E, I, O, P, T and Y

(page 5)

polynomial␣equationpolypharmaceuticalpolyphthalocyaninepolyribonucleotidepolysporangiophytepolyubiquitinylatepopular␣etymologiesporphyrinogenicityportal␣hypertensionpositive␣neutralitypostconceptionallypostdepositionallypostpericardiotomypostpolymerizationpotassium␣guanylatepotassium␣hydroxidepotential␣vorticitypotentiometricallypotentiostaticallyPottawatomie␣Countyprecompositionallyprecrystallizationpredecarboxylationpredispositionallypreoligodendrocyteprephosphorylatingprephosphorylationpresuppositionallypresymptomaticallypresynchronizationprimary␣hypothermiaprimary␣legislationPrince␣Edward␣CountyPrince␣George␣Countyprinciple␣of␣charityprobability␣densityprobability␣measureprobationary␣periodprojective␣geometryproofs␣by␣exhaustionproposition␣playersproprietary␣eponymsproprietary␣tradingpropriosensitivitypropylketobemidoneprosecution␣historyprosperity␣doctrineprosperity␣theologyproteoaminoglycansprotoanthophylliteprotocycloceratidsprotodesilylationsprotoplanetary␣discprotoplanetary␣diskprotoporphyrinogenprototype␣extensionproximoposteriorlypseudoanaphylacticpseudoetymologicalpseudogynecomastiapseudoheritabilitypseudohypertensionpseudohypertrophicpseudohyponatremiapseudoleukocytosispseudometaphysicalpseudomythologicalpseudopolycythemiapseudopsychopathicpseudosynaesthesiapseudouridylationspsychodermatologicpsychogeriatricianpsychomanipulativepsychoneurologistspsychoneuroticallypsychopathologizedpsychopathologizespsychopharmaceuticpsychophoneticallypsychosemanticallypsychosemioticallypsychotechnologiespsychotherapeuticspsychotherapeutistpsychrometric␣chartpsychrosensitivitypterylographicallyput␣out␣of␣one's␣miserypyelonephritogenicPyrénées-Orientalespyrheliometricallypyroelectric␣effectpyroelectrodynamicPythagorean␣triplesradiation␣pyrometerradiculomyelopathyradiculoneuropathyradiculoplexopathyradioimmunotherapyradiometallographyradiometeorographyreality␣pornographyrectosigmoidoscopyRed␣Queen␣hypothesisrenohistopathologyrepeated␣bodily␣harmrephosphorylationsrepresentationallyreproductive␣systemrespiratory␣pigmentrespiratory␣systemsreticulated␣pythonsreticulocytopeniasretinohypothalamicretinovasculopathyretrophylogenomicsrides␣the␣cotton␣ponyround-trip␣delay␣timeRoyal␣Leamington␣Spasafety-deposit␣boxessalpingovariectomyscansoriopterygidssecondary␣predationsecurity␣proceduressemiapologeticallysialoglycopeptidessialoglycoproteasesialoglycoproteinssialoglycoproteomesialylglycopeptidesialylglycoproteinsimple␣connectivitysleeping␣dictionarysling␣psychrometerssodicanthophyllitesodium␣hypochloritesolitary␣sandpiperssouthern␣yellow␣pinespectrocolorimetryspectrofluorimetryspectrographicallyspectroheliographyspectropolarimetryspirocycloheptanesspirocyclopentanesspondylarthritidesspondylotherapists

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 735 words
  • Spanish Wiktionary: 3 words
  • Italian Wiktionary: no word
  • German Wiktionary: 72 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 33 words

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