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There are 460 eighteen-letter words containing H, O, 2P, R and S

(page 3)

polyphosphorylatedpolyplethysmographpolysomnographicalpolysomnographistspolysporangiophytepops␣someone's␣cherryportal␣hypertensionPortuguese␣Sheepdogprehospitalizationprephosphorylatingprephosphorylationprinter's␣apostropheproazaphosphatraneprocolophonomorphsprosopographicallyprosperity␣theologyprospidium␣chlorideproteocephalideansprotopsychologicalprotopsychologistspseudobiographicalpseudodiphtheriticpseudohyperkalemiapseudohypertensionpseudohypertrophicpseudohyponatremiapseudoparaphylliumpseudophilosopherspseudophotographicpseudophotospherespseudophylactocarppseudopornographicpseudo-scholarshipspseudoxyrhophiinespsychic␣photographypsychobiographicalpsychogeographicalpsychographologistpsychopharmaceuticpsychopharmacologypsychoprophylacticpsychotherapeuticspsychotherapeutistpulmonary␣emphysemaput␣through␣its␣pacespyrophosphokinasespyrophosphoramidespyrophosphoric␣acidpyrophosphorolysispyrophosphorolyticpyrophosphorylasespyrophosphorylatedpyrophosphorylysespyrophosphorylysispyrophosphorylyticPythagorean␣triplesrephosphorylationsrheoplethysmographrhinoseptoplastiesrockhopper␣penguinsroughs␣up␣the␣bullpensalpingooophoritis salpingo-oophoritissalpingopharyngealsalpingopharyngeussapromycetophagoussecondary␣phosphinesemiphosphorescentseptorhinoplastiessharp-tailed␣sparrowshipping␣containerssince␣Hector␣was␣a␣pupslamdunk␣approaches slam-dunk␣approaches slam␣dunk␣approachesslapping␣on␣the␣wristsocial␣partnershipssole␣proprietorshipsomatoparaphreniassonosalpingographysonospectrographicSophie␣Germain␣primesopranino␣saxophonesoprano␣saxophonistsoprillo␣saxophonesspectrobolographicspectrodichrographspectrographicallyspectroheliographsspectroheliographyspectrohelioscopesspectrohelioscopicspectromorphometryspectrophotographsspectrophotographyspectrophotometersspectrophotometricspelaeogriphaceanssphaeropedunculatespirocycloheptanesspondylarthropathyspondyloperipheralspondylotherapistsspongiotrophoblastspurious␣diphthongsstereophotographerstereophotographicstereotypographersstopping␣the␣pressesstraight␣apostrophesubpostmastershipssupergiant␣amphipodsuperoleophobicitysuperphenomenalitysuperphysiologicalsupersophisticatedsupraphysiologicalsympathetic␣powderssymplectomorphismstelephone␣operatorstephrostratigraphytertiary␣phosphinestetrakisphosphatestetrathiophosphatetheophilanthropismtheophilanthropistthiophosphoric␣acidthiophosphorylatedthiopyrophosphatesthird-person␣pluralsthorn-apple␣crystalsthread␣pool␣patternsthromboprophylaxesthromboprophylaxisthrombosuppressionthrombosuppressivetin-pot␣dictatorshiptransphosphorylasetransphosphorylatetrialkylphosphinestricresyl␣phosphatetrimethylphosphinetriphenylphosphanetriphenylphosphatetriphenylphosphinetriphosphoric␣acidstriphosphorylationtrivinylphosphinestryptophan␣synthase

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 456 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: 3 words
  • German Wiktionary: 97 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 38 words

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