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There are 487 eighteen-letter words containing A, E, H, I, P, T and Y

(page 3)

palaeobiochemistrypalaeogeochemistrypalaeohydrologistspaleoichthyologistpanhypoproteinemiapanhypoproteinemicpapilioerythrinoneparathyroid␣hormoneparliamentary␣burghparliamentary␣heels Parliamentary␣heelsparthenocarpicallypathenogeneticallypellitory␣of␣the␣wallpersonality␣clashesperturbation␣theoryphanerocrystallinepharmacogenotypingpharmacoresistancypharyngealizationspharyngoepiglotticpharyngointestinalpharyngolaryngitesphenylbutanoic␣acidphenyldiazomethanephenylethanolaminePhiladelphia␣CountyPhilly␣cheesesteaksphosphatidylserinephosphoacetylationphosphoribosylatedphosphorocyanidatephosphorylcreatinephotoallergenicityphotodegradabilityphotographic␣memoryphotoimmunotherapyphotopolymerizablephotosyntheticallyphycoerythrocyaninphyletic␣gradualismphylobetadiversityphylotranscriptomephysical␣quantitiesphysical␣therapistsphysician␣extendersphysicomathematicsphysicotheologicalphysiopathogenesisphytohemagglutininphytohemaglutininephytopathogenicityphytotherapeuticalPiccadilly␣butcherspiss␣money␣up␣the␣wallplastohydroquinoneplayed␣it␣pear-shapedplayed␣the␣skin␣fluteplaying␣the␣race␣cardplay␣one's␣cards␣rightplays␣one's␣hand␣rightplays␣with␣a␣full␣deckplay␣the␣dickens␣withplay␣well␣with␣othersplay␣with␣edged␣toolsplay␣with␣house␣moneyplease␣say␣that␣againplethysmographicalpolitical␣machinerypolyalphabeticallypolychemotherapiespolychromatophilespolyendocrinopathypolypharmaceuticalpolyphthalocyaninepolysporangiophyteportal␣hypertensionpotassium␣hydroxidepreanaestheticallyprephosphorylatingprephosphorylationpresynchronizationpretherapeuticallyprimary␣hypothermiaprinciple␣of␣charityproofs␣by␣exhaustionprotoanthophyllitepseudoanaphylacticpseudoheritabilitypseudohyponatremiapseudometaphysicalpseudomythologicalpseudopolycythemiapseudopsychopathicpseudosynaesthesiapsychodermatologicpsychogeriatricianpsychomanipulativepsychoneuroticallypsychopathologizedpsychopathologizespsychopharmaceuticpsychophoneticallypsychosemanticallypsychosemioticallypsychotherapeuticspsychotherapeutistpsychrometric␣chartpterylographicallypyrheliometricallyPythagorean␣triplesradiculomyelopathyradiculoneuropathyradiculoplexopathyradioimmunotherapyradiometallographyradiometeorographyreality␣pornographyrenohistopathologyrepeated␣bodily␣harmrephosphorylationsreticulated␣pythonsretinohypothalamicretinovasculopathysandplay␣therapistssodicanthophyllitespectrographicallyspectroheliographyspirocycloheptanesspondylarthritidesspondylotherapistsSteeple␣with␣Tynehamsteganographicallystephanoberyciformstorage␣hypervisorssubtherapeuticallysuper-heavy␣frigatessuperphenomenalitysympatheticolyticssympathetic␣powderssympathetic␣stringssympathicomimeticssympathoadrenergicsympathoexcitationsympathoexcitatorysynapticulothecate

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 612 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 38 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 14 words

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