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There are 739 eighteen-letter words containing A, H, O, P, T and Y

(page 4)

parasympatholyticsparathyroid␣hormoneparthenocarpicallypassed␣under␣the␣yokepasses␣under␣the␣yokepathenogeneticallypathophysiologicalpathophysiologistspathopsychologicalpatristic␣anthologypay␣the␣debt␣of␣naturepellitory␣of␣the␣wallpersonality␣clashesperturbation␣theoryphaeochromocytomasphaerochromocytomaphanerocrystallinephantasmagoricallyphantom␣eye␣syndromepharmacogenotypingpharmacophenotypespharmacopsychiatrypharmacoresistancypharmacotoxicologypharyngealizationspharyngoepiglotticpharyngointestinalpharyngolaryngitespharyngolaryngitispharyngotonsilitisphenylbutanoic␣acidphenyldiazomethanephenylethanolaminepheochromocytomataPhiladelphia␣Countyphosphatidylserinephosphoacetylationphosphonopyruvatesphosphoribosylatedphosphorocyanidatephosphorylcreatinephotoallergenicityphotobiomodulatoryphotocatalyticallyphotocycloadditionphotodegradabilityphotogalvanographyphotographic␣memoryphotoimmunotherapyphotophosphorylasephotophysiologicalphotoplethysmogramphotopolymerizablephotoswitchabilityphotosyntheticallyphototypographicalphycoerythrocyaninphylobetadiversityphylostratigraphicphylotranscriptomephysicomathematicsphysicotheologicalphysiopathogenesisphysiopathologicalphysiopathologistsphytohemagglutininphytohemaglutininephytomorphologicalphytopathogenicityphytopharmacologicphytophysiologicalphytoplanktivorousphytoplankton␣bloomphytostabilisationphytostabilizationphytotherapeuticalphytotopographicalphytotoxicologicalpiss␣money␣up␣the␣wallplastohydroquinoneplay␣one's␣cards␣rightplays␣one's␣hand␣rightplay␣the␣pronoun␣gameplay␣well␣with␣othersplay␣with␣edged␣toolsplay␣with␣house␣moneyplethysmographicalpolitical␣machinerypolyalphabeticallypolychemotherapiespolychromatophilespolychromatophiliapolychromatophilicpolyendocrinopathypolyesterurethanespolyethercarbonatepolymethoxyflavonepolymethylacrylate polymethyl␣acrylatepolymorphonucleatepolypharmaceuticalpolyphosphorylatedpolyphthalocyaninepolyplethysmographpolysomnographistspolysporangiophyteportal␣hypertensionpositional␣asphyxiapostpsychoanalyticpotassium␣hydroxideprephosphorylatingprephosphorylationpresynchronizationpretty␣horsebreakerprimary␣hypothermiaprinciple␣of␣charityprocardiomyopathicproofs␣by␣exhaustionproselyte␣of␣the␣gateprotoanthophylliteprotopsychologicalpseudoanaphylacticpseudoheritabilitypseudohyponatremiapseudometallophytepseudometaphysicalpseudomythologicalpseudophylactocarppseudopolycythemiapseudopsychopathicpseudosynaesthesiapsychic␣photographypsychoacousticallypsychoacousticianspsychoanalyticallypsychocivilizationpsychodermatologicpsychodramaticallypsychogalvanometerpsychogalvanometrypsychogeriatricianpsychographologistpsychohistoricallypsycholinguisticalpsychologisticallypsychomanipulationpsychomanipulativepsychoneuroticallypsychopathological

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 541 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 32 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 14 words

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