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There are 801 eighteen-letter words containing D, I, O, R and Y

(page 5)

phenylcarbodiimidephosphatidylserinephosphoribosylatedphosphorocyanidatephosphorylceramidephotobiomodulatoryphotodegradabilityphylobetadiversitypink␣fairy␣armadillopiriformis␣syndromeplastohydroquinoneplaying␣Nostradamusplay␣one's␣cards␣rightplays␣one's␣hand␣rightpolycarboxylic␣acidpolydispersibilitypolydispersivitiespolydolopimorphianpolyendocrinopathypolyhydric␣alcoholspolyphosphoric␣acidpolyribonucleotidepolyvinylchlorides polyvinyl␣chloridespopulation␣pyramidspostpericardiotomypotassium␣hydroxidepowdery␣liveforeverpredecarboxylationpredispositionallypreoligodendrocytePresidency␣divisionPrince␣Edward␣Countyprobability␣densityprobationary␣periodprocardiomyopathicpropagandisticallyproprietary␣tradingpropylketobemidoneprosperity␣doctrineprotocycloceratidsprotodesilylationsprotomicrocotylidsprotoplanetary␣discprotoplanetary␣diskpseudoheritabilitypseudohyperkalemiapseudohypertensionpseudohypertrophicpseudohyponatremiapseudoparaphylliumpseudouridylationspseudoxyrhophiinespseudozygopleuridspsychodermatologicpsychodramaticallypulmonary␣docimasiapyrazolopyrimidinepyridinylimidazolepyridylsulfoximinepyrimidodiazepinespyrimidopyrimidinepyroelectrodynamicpyrophosphoramidespyrophosphoric␣acidpyrrolidinophenonequantum␣field␣theoryquasithermodynamicradiation␣chemistryradiation␣pyrometerradiculomyelopathyradiculoneuropathyradiculoplexopathyradioimmunoassayedradioimmunotherapyradiometallographyradiometeorographyradiosynovectomiesrectosigmoidectomyrectosigmoidoscopyRed␣Queen␣hypothesisreductionisticallyrepeated␣bodily␣harmreproductive␣systemresolution␣advisoryreticulated␣pythonsretrocycloadditionrhamnosylglucosiderhamnosylglycosiderides␣the␣cotton␣ponyround-trip␣delay␣timerumination␣syndromeSandmeyer␣reactionsSanfilippo␣syndromescansoriopterygidsscheduled␣territorySchnitzler␣syndromescimitar-horned␣oryxsecondary␣diagonalssecondary␣drowningssecondary␣educationsecondary␣emissionssecondary␣infectionsecondary␣intentionsecondary␣liabilitysecondary␣phosphinesecondary␣predationsecurity␣proceduresseismocardiographysell␣one's␣life␣dearlyserodiagnosticallysick␣office␣syndromeSir␣Roger␣de␣Coverleysix␣bob␣a␣day␣touristsskinny␣drink␣of␣watersleeping␣dictionarysmall␣penis␣syndromesmokestack␣industrysocioendocrinologysodium␣borohydridessodium␣hypochloritesolitary␣sandpiperssolubility␣productsspondylarthritidesspondyloperipheralspondylotherapistsstakeholder␣societystandard␣of␣identitystanding␣on␣ceremonysticky␣shed␣syndromestrongylocentrotidSt␣Totteringham's␣Daysulfonic␣anhydridessulphonic␣anhydridesummary␣proceedingssuperextraordinarysuspension␣syndromesympathetic␣powderssympathoadrenergicsynchronized␣clockssynchronized␣diverssynchronized␣diving

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 557 words
  • Spanish Wiktionary: 3 words
  • Italian Wiktionary: no word
  • German Wiktionary: 72 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 30 words

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