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There are 984 eighteen-letter words containing A, I, 2O, T and Y

(page 5)

nondecomposabilitynonenvironmentallynonheterosexualitynoninsurrectionarynonlogarithmicallynonpalmitoylatablenonphosphorylatingnonphosphorylationnonproblematicallynonproportionalitynonproteolyticallynonterminal␣symbols non-terminal␣symbolsnontopographicallynot␣in␣a␣million␣yearsnot␣in␣Kansas␣anymorenotoryctemorphiansnot␣Pygmalion␣likelyoctabromoporphyrinoctachlorobiphenyloctadehydrocorrinsoligodendrocytomasomnidimensionalityomnidirectionalityOmphalos␣hypothesisonomatopoieticallyophthalmologicallyopportunity␣classesopsonophagocytosisopsonophagocytoticoptoelectronicallyordinary␣resolutionorthopsychiatristsorthotypographicalosteocompatibilityotomicroscopicallyovariohysterectomyovercompensatinglyoverconservativelyoveroptimisticallyoverproportionallyoxydehydrogenationp-acetylaminophenolpachychoroidopathypachyrhizodontoidspaedopsychologistspalaeobiochemistrypalaeobiodiversityPalaeodicotyledonspalaeogeochemistrypalaeohydrologistspalaeoparasitologypalaeoproductivitypaleoichthyologistpaleomyrmecologistpaleopalynologistspanhypoproteinemiapanhypoproteinemicpapilioerythrinoneparathyroid␣hormonepathophysiologicalpathophysiologistspathopsychologicalpatristic␣anthologypellitory␣of␣the␣wallpentaformylgitoxinperfluoroarylationpericonceptionallyperturbation␣theorypharmacogenotypingpharmacotoxicologypharyngoepiglotticpharyngotonsilitisphosphoacetylationphosphoribosylatedphosphorocyanidatephosphorylcreatinephotoallergenicityphotobiomodulatoryphotocatalyticallyphotocycloadditionphotodegradabilityphotographic␣memoryphotoimmunotherapyphotophysiologicalphotopolymerizablephotoswitchabilityphotosyntheticallyphototypographicalphycoerythrocyaninphylotranscriptomephysicotheologicalphysiopathogenesisphysiopathologicalphysiopathologistsphytomorphologicalphytopathogenicityphytopharmacologicphytophysiologicalphytoplanktivorousphytostabilisationphytostabilizationphytotopographicalphytotoxicologicalpicocyanobacterialpicocyanobacteriumplastohydroquinoneplay␣with␣edged␣toolsplay␣with␣house␣moneypoikiloblasticallyPoland␣Is␣Not␣Yet␣Lostpolitically␣correctpolyacrylonitrilespolychemotherapiespolychromatophilespolychromatophiliapolychromatophilicpolyclonal␣antibodypolycontexturalitypolydenominationalpolyendocrinopathypolyesterificationpolyfunctionalisedpolyfunctionalizedpolygamma␣functionspolymicrobacterialpolymolecularitiespolynomial␣equationpolynomial␣functionpolyphthalocyaninepolysomnographistspolysporangiophytepolyubiquitinationpolyubiquitylationpolyvictimizationspopular␣etymologiespopulation␣pyramidsportal␣hypertensionpositional␣asphyxiapostconceptionallypostdepositionallypostdiagnosticallypostfoundationallypostpericardiotomypostpolymerizationpostpsychoanalyticpostranslationallypotassium␣hydroxidepotential␣vorticitypotentiometricallypotentiostaticallyPottawatomie␣County

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 481 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 18 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 16 words

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