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There are 472 eighteen-letter words containing I, 2O, 2R and Y

(page 3)

orthopsychiatristsorthotypographicalovariohysterectomyoverconservativelyoverproportionallypalaeohydrographicpapilioerythrinoneparaprofessionallyparathyroid␣hormoneParkinson's␣syndromepepsinhydrochloricperfluoroarylationperturbation␣theorypharmacophoricallyphilosophers␣by␣firephosphorylceramidephosphorylcreatinephotographic␣memoryphotoreversibilityphycoerythrobilinsphycoerythrocyaninphylotranscriptomepin␣a␣rose␣on␣your␣nosepiperonylonitrilespiriformis␣syndromepleuroperipneumonypolitically␣correctpolyacrylonitrilespolygon-circle␣graphpolymicrobacterialporphyrinogenicityportal␣hypertensionpostpericardiotomypour␣honey␣in␣one's␣earpowdery␣liveforeverpredecarboxylationpreoligodendrocyteprephosphorylatingprephosphorylationpresynchronizationPrince␣George␣Countyprobationary␣periodprocardiomyopathicproinflammationaryprojective␣geometrypromorphologicallypropionylpromasineproposition␣playersproprietary␣eponymspropriosensitivityprosecution␣historyprosopographicallyprosperity␣doctrineprosperity␣theologyprotocoligoricallyprotocycloceratidsprotomicrocotylidsprotomyofibroblastprotoplanetary␣discprotoplanetary␣diskprotoporphyrinogenproximoposteriorlypseudohypertrophicpyrazolopyrimidinepyroelectrodynamicpyrophosphoramidespyrophosphoric␣acidpyrophosphorolysispyrophosphorolyticpyrophosphorylysispyrophosphorylyticpyrrolidinophenoneradiation␣pyrometerradiculoneuropathyradioimmunotherapyradiometallographyradiometeorographyreality␣pornographyregistration␣countyrephosphorylationsresolution␣advisoryrestoration␣ecologyresynchronisationsresynchronizationsretrocycloadditionretrophylogenomicsrhinolaryngoscopesribopuromycylationRocky␣Mountain␣feverrosebay␣willowherbsrotational␣symmetryrumination␣syndromesaccopharyngiformsscansoriopterygidsscimitar-horned␣oryxsecondary␣drowningssecondary␣predationseismocardiographyservant␣out␣of␣liverySir␣Roger␣de␣CoverleySir␣Roger␣of␣Coverleysodium␣borohydridesspectrocolorimetryspectrofluorimetryspectroheliographyspectropolarimetryspirocyclopropanesspondyloperipheralstatutory␣authoritystephanoberyciformstereoisomericallystorage␣hypervisorsstrongylocentrotidstrontiopyrochloresuffer␣by␣comparisonsuperiority␣complexsuperstoichiometrysymproportionationsyringohydromyeliaTaylor-White␣processtelephone␣directorytetrahydridoboratetetrahydrochloridetetrahydrocortisoltetraiodothyroninetheory␣of␣everythingtheory␣of␣relativitythermoacoustimetrythermohydrodynamicthermophoreticallythermoradiotherapythermoresponsivitythiocarbohydrazidethromboprophylaxisthyrohyoid␣membranethyrotropic␣hormonetitan␣primary␣schoolTommy␣John␣surgeriesTooley␣Street␣tailorToonerville␣Trolleytouring␣motorcyclestranscarboxylationtransferuloylationtransformationallytranshydrogenation trans-hydrogenation

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 290 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 27 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 7 words

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