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There are 903 eighteen-letter words containing O, P, R, S and Y

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noncompressibilitynonintrospectivelynonphosphorylatingnonphosphorylationnonpolysaccharidesnonsuppressibilitynonthienopyridinesnormophysiologicalnot␣just␣a␣pretty␣facenotoryctemorphiansnucleodepolymerasenucleopolyhedrosisOlympic␣Winter␣Gamesopportunity␣classesOppression␣OlympicsOrdnance␣Survey␣mapsorthopsychiatristsoscillographicallyosteochondrophytesosteochondroplastyotomicroscopicallyovercompensatinglyoveroptimisticallyoverplayed␣one's␣handoverpsychologizingoversimplisticallyoversusceptibilityoxygen␣catastrophesoysterman's␣stoppersPaal-Knorr␣synthesesPaal-Knorr␣synthesispachycephalosauridpachydermatousnesspachypleurosauridspachyrhizodontoidsPaisley␣Undergroundpalaeobiochemistrypalaeobiodiversitypalaeogeochemistrypalaeohydrologistspalaeoparasitologypalaeozygopleuridspaleomyrmecologistpalynostratigraphypanhypopituitarismparanasopharyngealparaneoplasticallyparapodiapophysealparaprofessionallyparasympatholyticsparatympanic␣organsParkinson's␣syndromeParry␣Sound␣Districtparsimony␣principleparty␣and␣party␣costspassed␣under␣the␣yokepasses␣under␣the␣yokePatagonia␣cypressespatristic␣anthologypaying␣one's␣respectspentafluorostyrenepentylenetetrazolspepsinhydrochloricperchloroethylenesperitoneal␣dialysisperonosporomycetespersonality␣clashespersonally␣attackedphaeochromocytomasphanerocrystallinephantasmagoricallyphantom␣eye␣syndromepharmacophenotypespharmacophysiologypharmacopsychiatrypharmacoresistancypharyngealizationspharyngobranchialspharyngoesophagealpharyngointestinalpharyngolaryngitespharyngolaryngitispharyngotonsilitisphenylboronic␣acidsphenylchlorosilanephilosophers␣by␣firephloroglucinolysisphosphatidylserinephosphonoglycerolsphosphonopyruvatesphosphoribosylatedphosphorocyanidatephosphorylceramidephosphorylcholinesphosphorylcreatinephotophosphorylasephotoplethysmogramphotoreversibilityphycoerythrobilinsphylobetadiversityphylostratigraphicphylotranscriptomephysical␣geographerphysiobiochemistryphysiogeographicalphytomorphologistsphytoplanktivorouspiezopsychrophilicpin␣a␣rose␣on␣your␣nosepiperonylonitrilespiriformis␣syndromeplastohydroquinoneplaying␣Nostradamusplay␣one's␣cards␣rightplays␣Old␣Gooseberryplays␣one's␣cards␣wellplays␣one's␣hand␣rightplay␣well␣with␣othersplethysmographicalpolicy␣interest␣ratepolyacrylonitrilespolychemotherapiespolychromatophilespolydispersibilitypolydispersivitiespolyesterificationpolyesterurethanespolyethersulphonespolygalacturonasespolygalacturonatespolyhydric␣alcoholspolyhydroxyphenolspolymerizabilitiespolymerogenicitiespolymolecularitiespolymorphonuclearsPolynesian␣Trianglepolypharmacologiespolyphosphoric␣acidpolyphosphorylatedpolyplethysmographpolypseudorotaxanepolysomnographicalpolysomnographistspolysporangiophytepolyunsaturated␣fatpolyvalerolactones

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 818 words
  • Spanish Wiktionary: 2 words
  • Italian Wiktionary: no word
  • German Wiktionary: 65 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 40 words

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