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There are 470 eighteen-letter words containing E, H, 2O, P, T and Y

(page 3)

pheochromocytomataphiloprogenitivelyphosphoacetylationphosphonopyruvatesphosphoribosylatedphosphorocyanidatephosphorylcreatinephosphoselectivityphosphosensitivityphosphospecificityphotoallergenicityphotobiotechnologyphotodegradabilityphotoendosomolysisphotoendosomolyticphotoendosymbiontsphotogeomorphologyphotographic␣memoryphotoimmunotherapyphotophosphorylasephotoplethysmogramphotopolymerizablephotoreversibilityphotosyntheticallyphycoerythrobilinsphycoerythrocyaninphylotranscriptomephysicotheologicalphysiobiochemistryphysiopathogenesisphytopathogenicityphytophenomenologyphytophysiognomiesplastohydroquinoneplay␣the␣pronoun␣gameplay␣with␣edged␣toolsplay␣with␣house␣moneypolychemotherapiespolychromatophilespolyendocrinopathypolyethercarbonatepolyethersulphonespolyethyleneglycol polyethylene␣glycolpolyhomonucleotidepolymethoxyflavonepolymorphonucleatepolyphosphorylatedpolyphthalocyaninepolyplethysmographpolysporangiophyteporphyrinogenicityportal␣hypertensionpotassium␣hydroxideprephosphorylatingprephosphorylationpresynchronizationproofs␣by␣exhaustionprosecution␣historyproselyte␣of␣the␣gateprosperity␣theologyprotoanthophylliteprotoporphyrinogenpseudoheterozygouspseudohypertensionpseudohypertrophicpseudohyponatremiapseudometallophytepseudomythologicalpseudophylactocarppseudopolycythemiapseudopsychopathicpsychodermatologicpsychogalvanometerpsychogalvanometrypsychoneurologistspsychoneuroticallypsychopathologizedpsychopathologizespsychophoneticallypsychosemioticallypsychotechnologiespyelonephritogenicpyrophosphorylatedPythagorean␣theoremradiculomyelopathyradiculoneuropathyradiculoplexopathyradioimmunotherapyradiometallographyradiometeorographyreality␣pornographyrenohistopathologyrephosphorylationsretinohypothalamicretinovasculopathyretrophylogenomicsrheoplethysmographrides␣the␣cotton␣ponysapromycetophagoussodicanthophyllitesodium␣hypochloritesouthern␣yellow␣pinespectroheliographyspectromorphometryspectrophotographyspherostomatocytesspirocycloheptanessplenohepatomegalyspondylomyelopathyspondylotherapistsstephanoberyciformstereotypographersstorage␣hypervisorsstrontiopyrochloresubpsychotomimeticsuperoleophobicitysuperstoichiometrysympathoexcitationsympathoexcitatorysymphony␣orchestrassymplectomorphismstautomorphemicallyTaylor-White␣processtelecobaltotherapytelephone␣directorytenoepiphysiodesistetrahydropyrrolesthermokeratoplastythermophoreticallythermophysiologiesthermoradiotherapythermoresponsivitythiophosphorylatedthiopyrophosphatesthrombelastographythrombocytopaeniasthrombocytopathiesthrombocytopoiesisthrombocytopoieticthromboprophylaxesthyrotropic␣hormonetonsillopharyngealtransphosphorylasetransphosphorylatetrash␣heap␣of␣historytrichlorobiphenylstrichlorodiphenylstrimethylolpropanetryptophylquinonestypographical␣errorunphosphorylatable

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 318 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 23 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 7 words

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