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There are 483 eighteen-letter words containing H, O, 2P, R and T

(page 3)

photoperturbationsphotophosphorylasephotopiezoelectricphotoplethysmogramphotopolymerizablephotoprecipitationphotoreproductionsphotorespirometersphotospectrometersphotospectrometricphotospectroscopicphototherapeuticalphotothermoplasticphototopographicalphototypographicalphrasal␣prepositionphthirapterologistphylostratigraphicphylotranscriptomephytomorphologicalphytomorphologistsphytopharmacologicphytoplanktivorousphytotherapeuticalphytotopographicalpick␣up␣the␣threads␣ofpicophotoautotrophplainclothespersonplay␣the␣pronoun␣gameplethysmographicalpleuraspidotheriidpneumotherapeuticsPointe␣Coupee␣Parishpolychemotherapiespolychromatophilespolychromatophiliapolychromatophilicpolyendocrinopathypolyethersulphonespolymorphonucleatepolypharmaceuticalpolyphosphorylatedpolyplethysmographpolysomnographistspolysporangiophyteporphyrinogenicityportal␣hypertensionPortuguese␣Sheepdogprehospitalizationprephosphorylatingprephosphorylationprimary␣hypothermiaprinciple␣of␣charityprinter's␣apostropheproazaphosphatraneprocardiomyopathicprosperity␣theologyproteocephalideansprothoracicotropicprotoanthophylliteprotochlorophilideprotoporphyrinogenprotopsychologicalprotopsychologistspseudodiphtheriticpseudohypertensionpseudohypertrophicpseudohyponatremiapseudophotographicpseudophotospherespseudophylactocarppsychic␣photographypsychographologistpsychopharmaceuticpsychoprophylacticpsychotherapeuticspsychotherapeutistpteromerhanophobiapterylographicallyput␣through␣its␣pacespyelonephritogenicpyrophosphorolyticpyrophosphorylatedpyrophosphorylyticPythagorean␣triplesradiculoplexopathyRappahannock␣Countyreality␣pornographyrephosphorylationsrheoplethysmographrhinoseptoplastiesroughs␣up␣the␣bullpensalpingooophoritis salpingo-oophoritissapromycetophagoussemiphosphorescentseptorhinoplastiessharp-tailed␣sparrowshipping␣containerssince␣Hector␣was␣a␣pupslapping␣on␣the␣wristsocial␣partnershipssole␣proprietorshipsomatoparaphreniassonospectrographicsoprano␣saxophonistspectrobolographicspectrodichrographspectrographicallyspectroheliographsspectroheliographyspectrohelioscopesspectrohelioscopicspectromorphometryspectrophotographsspectrophotographyspectrophotometersspectrophotometricsphaeropedunculatespirocycloheptanesspondylarthropathyspondylotherapistsspongiotrophoblastspurious␣diphthongsstereophotographerstereophotographicstereotypographersstopping␣the␣pressesstraight␣apostrophesubpostmastershipssupergiant␣amphipodsuperoleophobicitysuperphenomenalitysupersophisticatedsympathetic␣powderssymplectomorphismstelephone␣operatorstephrostratigraphytertiary␣phosphinestetrakisphosphatestetrathiophosphatetheophilanthropismtheophilanthropistthiophosphoric␣acidthiophosphorylatedthiopyrophosphatesthird-person␣pluralsthorn-apple␣crystalsthread␣pool␣patternsthromboprophylaxes

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 442 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 78 words
  • Portuguese Wiktionary: 3 words
  • Dutch Wiktionary: 32 words

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