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There are 913 eighteen-letter words containing A, E, I, 2O and Y

(page 5)

oligohymenophoreanoligohypomenorrheaoligoparaphenyleneomnidimensionalityomnidirectionalityOmphalos␣hypothesisonomatopoieticallyopportunity␣classesoptoelectronicallyordinary␣resolutionosteocompatibilityovariohysterectomyovercompensatinglyoverconservativelyoveroptimisticallyoverproportionallyoxydehydrogenationp-acetylaminophenolpaedopsychologicalpaedopsychologistspalaeobiochemistrypalaeobiodiversitypalaeobiogeographyPalaeodicotyledonspalaeoecologicallypalaeoepidemiologypalaeogeochemistrypalaeohydrographicpalaeohydrologicalpalaeohydrologistspalaeomicrobiologypalaeoparasitologypalaeophycologicalpalaeoproductivitypalaeozygopleuridspaleoichthyologistpaleomyrmecologistpaleopalynologicalpaleopalynologistspaleophysiologicalpaleopsychologicalpanhypoproteinemiapanhypoproteinemicpapilioerythrinoneparapodiapophysealparaprofessionallyparathyroid␣hormoneParkinson's␣syndromepellitory␣of␣the␣wallpentaformylgitoxinperfluoroarylationpericonceptionallyperturbation␣theorypharmacogenotypingpharyngoepiglotticphenomenologicallyphenylboronic␣acidsphenylchlorosilanephosphoacetylationphosphoribosylatedphosphorocyanidatephosphorylceramidephosphorylcreatinephotoallergenicityphotodegradabilityphotographic␣memoryphotoimmunotherapyphotopolymerizablephotosyntheticallyphycoerythrocyaninphylotranscriptomephysicotheologicalphysiogeographicalphysiopathogenesisphytopathogenicitypicocyanobacterialpicocyanobacteriumpin␣a␣rose␣on␣your␣noseplastohydroquinoneplay␣with␣edged␣toolsplay␣with␣house␣moneyPoland␣Is␣Not␣Yet␣Lostpolitically␣correctpolyacrylonitrilespolybenzimidazolespolychemotherapiespolychromatophilespolycontexturalitypolydenominationalpolyendocrinopathypolyesterificationpolyfunctionalisedpolyfunctionalizedpolygamomonoeciouspolygon-circle␣graphpolymicrobacterialpolymolecularitiespolynomial␣equationpolypharmacologiespolyphenoloxidasespolyphthalocyaninepolysporangiophytepolyvinylsiloxanespopular␣etymologiesportal␣hypertensionpostconceptionallypostdepositionallypostpericardiotomypostpolymerizationpotassium␣hydroxidepotential␣vorticitypotentiometricallypotentiostaticallyPottawatomie␣Countypour␣honey␣in␣one's␣earprecompositionallypredecarboxylationpredispositionallyprephosphorylatingprephosphorylationpresuppositionallypresynchronizationprobationary␣periodprolymphangiogenicproofs␣by␣exhaustionpropionylpromasineproposition␣playersproprietary␣eponymsproteoaminoglycansprotoanthophylliteprotocycloceratidsprotodesilylationsprotoplanetary␣discprotoplanetary␣diskpseudobiologicallypseudoetymologicalpseudogynecomastiapseudohyponatremiapseudomythologicalpseudopolycythemiapseudopsychopathicpseudouridylationspsychodermatologicpsychogeographicalpsychoneurologicalpsychoneuroticallypsychopathologizedpsychopathologizespsychophoneticallypsychosemioticallypulmonary␣embolisms

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 570 words
  • Spanish Wiktionary: 2 words
  • Italian Wiktionary: no word
  • German Wiktionary: 22 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 20 words

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