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There are 817 eighteen-letter words containing A, C, E, H and Y

(page 5)

pachycephalosauridpachydermatousnesspachypleurosauridspaedopsychologicalpaedopsychologistspalaeobiochemistrypalaeogeochemistrypalaeohydrographicpalaeohydrologicalpalaeophycologicalpaleochemotaxonomypaleoichthyologistpaleophysiologicalpaleopsychologicalpanhypoproteinemicparthenocarpicallypathenogeneticallypersonality␣clashesphaeochromocytomasphaerochromocytomaphanerocrystallinepharmacogenotypingpharmacophenotypespharmacoresistancypharyngoepiglotticphenomenologicallyphenylacetaldehydephenylboronic␣acidsphenylbutanoic␣acidphenylcarbamic␣acidphenylcarbodiimidephenylchlorosilanephenylenedicarbenepheochromocytomataPhiladelphia␣CountyPhilly␣cheesesteaksphosphoacetylationphosphorocyanidatephosphorylceramidephosphorylcreatinephotoallergenicityphotographic␣memoryphotosyntheticallyphycoerythrocyaninphyletic␣gradualismphylotranscriptomephysical␣geographerphysical␣quantitiesphysical␣therapistsphysician␣extendersphysicochemicalismphysicomathematicsphysicotheologicalphysiogeographicalphytopathogenicityphytotherapeuticalPiccadilly␣butchersplaying␣the␣race␣cardplay␣one's␣cards␣rightplays␣with␣a␣full␣deckplay␣the␣dickens␣withplethysmographicalpneumocolonographypolitical␣machinerypolyalphabeticallypolychemotherapiespolychromatophilespolyendocrinopathypolyethercarbonatepolygon-circle␣graphpolymethylacrylate polymethyl␣acrylatepolymorphocellularpolymorphonuclearspolymorphonucleatepolypharmaceuticalpolypharmacologiespolyphthalocyaninepreanaestheticallypresynchronizationpretherapeuticallyprinciple␣of␣charityprolymphangiogenicpseudoanaphylacticpseudometaphysicalpseudomythologicalpseudophylactocarppseudopolycythemiapseudopsychopathicpsychodermatologicpsychogalvanometerpsychogalvanometrypsychogeographicalpsychogeriatricianpsychomanipulativepsychoneurologicalpsychoneuroticallypsychopathologizedpsychopathologizespsychopharmaceuticpsychophoneticallypsychosemanticallypsychosemioticallypsychotherapeuticspsychotherapeutistpsychrometric␣chartpterylographicallypyrheliometricallyquasithermodynamicracially␣challengedradiation␣chemistryradiculomyelopathyradiculoneuropathyradiculoplexopathyRayleigh␣scatteringrestless␣flycatcherresynchronisationsresynchronizationsreticulated␣pythonsretinohypothalamicretinovasculopathyretrosyntheticallyrhamnosylglucosiderhamnosylglycosiderhinolaryngoscopessapromycetophagousscimitar-horned␣oryxsecondary␣phosphineseismocardiographyselling␣by␣the␣candlesemibiographicallysialyldisaccharidesocial␣psychologiessodicanthophylliteSouthwick␣and␣Widleyspectrographicallyspectroheliographyspectrophotographyspherostomatocytesspirocycloheptanesspotted␣flycatcherssquashed␣fly␣biscuitstakeholder␣societystaying␣the␣distancesteganographicallystephanoberyciformstoichiometricallysubtherapeuticallysulfinic␣anhydridessulfonic␣anhydrides

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 649 words
  • Spanish Wiktionary: 2 words
  • Italian Wiktionary: no word
  • German Wiktionary: 91 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 27 words

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