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There are 895 eighteen-letter words containing H, O, P, R and Y

(page 5)

phloroglucinolysisphosphatidylserinephosphonoglycerolsphosphonopyruvatesphosphoribosylatedphosphorocyanidatephosphorylceramidephosphorylcholinesphosphorylcreatinephotoallergenicityphotobiomodulatoryphotodegradabilityphotogalvanographyphotogeomorphologyphotographic␣memoryphotoimmunotherapyphotophosphorylasephotoplethysmogramphotopolymerizablephotoreversibilityphototypographicalphycoerythrobilinsphycoerythrocyaninphylobetadiversityphylostratigraphicphylotranscriptomephysical␣geographerphysiobiochemistryphysiogeographicalphytomorphologicalphytomorphologistsphytopharmacologicphytoplanktivorousphytotherapeuticalphytotopographicalpiezopsychrophilicplastohydroquinoneplay␣one's␣cards␣rightplays␣one's␣hand␣rightplay␣the␣pronoun␣gameplay␣well␣with␣othersplethysmographicalpneumocolonographypolitical␣machinerypolychemotherapiespolychlorobiphenylpolychromatophilespolychromatophiliapolychromatophilicpolydolopimorphianpolyendocrinopathypolyesterurethanespolyethercarbonatepolyethersulphonespolygon-circle␣graphpolyhydric␣alcoholspolyhydroxyphenolspolymethylacrylate polymethyl␣acrylatepolymorphocellularpolymorphonuclearspolymorphonucleatepolypharmaceuticalpolypharmacologiespolyphloroglucinolpolyphosphoric␣acidpolyphosphorylatedpolyplethysmographpolysomnographicalpolysomnographistspolysporangiophytepolyvinylchlorides polyvinyl␣chloridespops␣someone's␣cherryporphyrinogenicityportal␣hypertensionpotassium␣hydroxidepour␣honey␣in␣one's␣earprephosphorylatingprephosphorylationpresynchronizationpretty␣horsebreakerprimary␣hypothermiaprinciple␣of␣charityprocardiomyopathicprolymphangiogenicpromorphologicallyproofs␣by␣exhaustionprosecution␣historyproselyte␣of␣the␣gateprosopographicallyprosperity␣theologyprotoanthophylliteprotoporphyrinogenprotopsychologicalprotopsychologistspseudoheritabilitypseudoheterozygouspseudohyperkalemiapseudohypertensionpseudohypertrophicpseudohyponatremiapseudomerohedrallypseudoparaphylliumpseudophylactocarppseudoxyrhophiinespsychic␣photographypsychobiographicalpsychodermatologicpsychodramaticallypsychogalvanometerpsychogalvanometrypsychogeographicalpsychogeriatricianpsychographologistpsychohistoricallypsychoneurologicalpsychoneurologistspsychoneuroticallypsychopharmaceuticpsychopharmacologypsychoprophylacticpsychotherapeuticspsychotherapeutistpsychotraumatologypsychrometric␣chartpsychrosensitivitypterylographicallypulmonary␣emphysemapunch␣drunk␣syndromepupillographicallypyelonephritogenicpyranoanthocyaninspyrheliometricallypyrophosphokinasespyrophosphoramidespyrophosphoric␣acidpyrophosphorolysispyrophosphorolyticpyrophosphorylasespyrophosphorylatedpyrophosphorylysespyrophosphorylysispyrophosphorylyticpyrrolidinophenonePythagorean␣theoremPythagorean␣triplesradiculomyelopathyradiculoneuropathyradiculoplexopathyradioimmunotherapy

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 765 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 64 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 25 words

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