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There are 1687 eighteen-letter words containing A, E, I, O and Y

(page 9)

palaeozygopleuridspaleoichthyologistpaleomyrmecologistpaleopalynologicalpaleopalynologistspaleophysiologicalpaleopsychologicalpalmitoylcarnitinepancreaticobiliarypanhypoproteinemiapanhypoproteinemicpapilioerythrinoneparaneoplasticallyparapodiapophysealparaprofessionallyparathyroid␣hormoneParkinson's␣syndromeparsimony␣principleparthenocarpicallyPatagonia␣cypressespathenogeneticallypaying␣one's␣respectspayload␣specialistspellitory␣of␣the␣wallpentaformylgitoxinperfluoroarylationperformance␣anxietypericonceptionallypericyclic␣reactionperiodic␣inequalityperitoneal␣dialysisperpetual␣inventorypersonality␣clashesperturbation␣theoryphanerocrystallinepharmacogenotypingpharmacoresistancypharyngealizationspharyngoepiglotticpharyngointestinalpharyngolaryngitesphenomenologicallyphenylboronic␣acidsphenylbutanoic␣acidphenylcarbodiimidephenylchlorosilanephenyldiazomethanephenylethanolaminePhiladelphia␣CountyPhilippine␣mahoganyphosphatidylserinephosphoacetylationphosphoribosylatedphosphorocyanidatephosphorylceramidephosphorylcreatinephotoallergenicityphotodegradabilityphotographic␣memoryphotoimmunotherapyphotopolymerizablephotosyntheticallyphycoerythrocyaninphylobetadiversityphylotranscriptomephysical␣geographerphysicochemicalismphysicomathematicsphysicotheologicalphysiogeographicalphysiopathogenesisphytohemagglutininphytohemaglutininephytopathogenicityphytotherapeuticalpicocyanobacterialpicocyanobacteriumpin␣a␣rose␣on␣your␣nosepiss␣money␣up␣the␣wallplastohydroquinoneplay␣one's␣cards␣rightplays␣one's␣hand␣rightplay␣well␣with␣othersplay␣with␣edged␣toolsplay␣with␣house␣moneyplethysmographicalPoland␣Is␣Not␣Yet␣Lostpolicy␣interest␣ratepolitically␣correctpolitical␣machinerypolyacrylonitrilespolyalphabeticallypolybenzimidazolespolychemotherapiespolychromatophilespolycontexturalitypolydenominationalpolyendocrinopathypolyesterificationpolyfunctionalisedpolyfunctionalizedpolygamomonoeciouspolygon-circle␣graphpolymerizabilitiespolymicrobacterialpolymolecularitiesPolynesian␣Trianglepolynomial␣equationpolypharmaceuticalpolypharmacologiespolyphenoloxidasespolyphenylalanines poly-phenylalaninespolyphthalocyaninepolysporangiophytepolyubiquitinylatepolyvinylsiloxanespopular␣etymologiesportal␣hypertensionpositive␣neutralitypostconceptionallypostdepositionallypostpericardiotomypostpolymerizationpotassium␣guanylatepotassium␣hydroxidepotential␣vorticitypotentiometricallypotentiostaticallyPottawatomie␣Countypour␣honey␣in␣one's␣earprecompositionallyprecrystallizationpredecarboxylationpredispositionallyprephosphorylatingprephosphorylationpresuppositionallypresymptomaticallypresynchronizationprimary␣hypothermiaprimary␣legislationPrince␣Edward␣Countyprinciple␣of␣charityprobability␣densityprobability␣measure

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 1321 words
  • Spanish Wiktionary: 4 words
  • Italian Wiktionary: no word
  • German Wiktionary: 84 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 57 words

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