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There are 689 eighteen-letter words containing A, G, I, O and Y

(page 4)

overcompensatinglyoxydehydrogenationpaedopsychologicalpaedopsychologistsPaisley␣Undergroundpalaeobiogeographypalaeoecologicallypalaeoepidemiologypalaeogeochemistrypalaeohydrographicpalaeohydrologicalpalaeohydrologistspalaeomagneticallypalaeomicrobiologypalaeoparasitologypalaeophycologicalpalaeozygopleuridspaleoichthyologistpaleomyrmecologistpaleopalynologicalpaleopalynologistspaleophysiologicalpaleopsychologicalpalynostratigraphyparatympanic␣organsPatagonia␣cypressespathenogeneticallypathophysiologicalpathophysiologistspathopsychologicalpatristic␣anthologypaying␣one's␣respectspentaformylgitoxinphantasmagoricallypharmacogenotypingpharmacophysiologypharmacotoxicologypharyngealizationspharyngobranchialspharyngoepiglotticpharyngointestinalpharyngolaryngitespharyngolaryngitispharyngotonsilitisphenomenologicallyPhilippine␣mahoganyphotoallergenicityphotodegradabilityphotographic␣memoryphotophysiologicalphototypographicalphylostratigraphicphysical␣geographerphysicotheologicalphysiogeographicalphysiopathogenesisphysiopathologicalphysiopathologistsphytohemagglutininphytohemaglutininephytomorphologicalphytopathogenicityphytopharmacologicphytophysiologicalphytotopographicalphytotoxicologicalplaying␣Nostradamusplay␣one's␣cards␣rightplays␣one's␣hand␣rightplay␣with␣edged␣toolsplethysmographicalpolygamma␣functionspolygamomonoeciouspolygon-circle␣graphPolynesian␣Trianglepolypharmacologiespolysomnographicalpolysomnographistspolysporangiophytepolyubiquitinatingpolyubiquitylatingpopular␣etymologiespostdiagnosticallypostlinguisticallypotassium␣guanylateprephosphorylatingprimary␣legislationprolymphangiogenicpromorphologicallypropagandisticallyproprietary␣tradingprosopographicallyproteoaminoglycansprotocoligoricallyprotopsychologicalpseudobiologicallypseudoetymologicalpseudogynecomastiapseudomythologicalpsychic␣photographypsychobiographicalpsychobiologicallypsychocosmologicalpsychodermatologicpsychogeographicalpsychogeriatricianpsychographologistpsycholinguisticalpsychological␣slipspsychologisticallypsychoneurologicalpsychopathologicalpsychopathologistspsychopathologizedpsychopathologizespsychosociologicalpterylographicallypupillographicallypyroglutamylationsPythagorean␣triplesqualifying␣positionQuiyoughcohannocksradiometallographyradiometeorographyreality␣pornographyregistration␣countyrenohistopathologyRepublic␣of␣Paraguayrespiratory␣pigmentrestoration␣ecologyrhamnosylglucosiderhamnosylglycosiderhinolaryngoscopesRiemannian␣geometryroentgenologicallyRoyal␣Leamington␣Sparoyal␣straight␣flushsaccopharyngiformssalpingopharyngealsalpingopharyngeussalpingoscopicallysalpingovariectomySan␣Augustine␣Countyscansoriopterygidssecondary␣diagonalssecondary␣drowningssedimentologicallyseismocardiographysell␣in␣May␣and␣go␣awaysemiapologetically

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 402 words
  • Spanish Wiktionary: 2 words
  • Italian Wiktionary: no word
  • German Wiktionary: 29 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 21 words

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