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There are 743 twenty-one-letter words containing I, O, S and Y

(page 5)

phosphoaminoglycosidephosphoribohydrolasesphotodecarbonylationsphotodecarboxylationsphotodehydrogenationsphotodynamic␣therapiesphotoelectrocatalysisphotoelectrochemistryphotoelectrosynthesisphotoelectrosyntheticphotomechanochemistryphotophosphorylationsphotoplethysmographicphotothermoelasticityPhra␣Nakhon␣Si␣Ayutthayaphthalylsulfathiazolephysicomathematicallyphysicomathematiciansphysiologic␣dead␣spacesphysiopharmacologicalphysiotherapeuticallyphytohaemoagglutininspillars␣of␣the␣communityplayed␣it␣close␣to␣the␣hipplaying␣one's␣cards␣rightplaying␣with␣house␣moneyplay␣into␣someone's␣handsplay␣one␣against␣anotherplay␣the␣hand␣one␣is␣dealtPlummer-Vinson␣syndromepneumocystis␣pneumoniapoikilochlorophyllouspolluter␣pays␣principlepollution␣permit␣systempolydimethylsiloxanespolyphosphoinositidespolysialogangliosidespolysialyltransferasepolysynthetic␣twinningpolyvinylpyrrolidonespopping␣someone's␣cherrypositive␣polarity␣itemspossibility␣of␣reverterposterior␣spinal␣arterypostperfusion␣syndromeposttranscriptionallypotassium␣ferrocyanidePotter-Bucky␣diaphragmspoverty␣is␣a␣state␣of␣mindpreestablished␣harmony pre-established␣harmonypremenstrual␣dysphoriaprimary␣reinforcementsprobability␣amplitudesproofs␣by␣contradictionpropargylestrenedioneprostatovesiculectomyprotacanthopterygiansProto-Malayo-Polynesianpseudophosphorylationpsychological␣hedonismpsychological␣injuriespsychoneuroimmunologypsychopathophysiologypsychopharmaceuticalspsychopharmacologicalpsychopharmacologistspsychophysiologicallypsychotherapeuticallypsychotraumatizationspsychotraumatologicalpsychotraumatologistspterygomaxillary␣fossapterygopalatine␣fossaepulmonary␣circulationspulmonary␣function␣testpulmonary␣tuberculosispurchasing␣power␣paritypyranonaphthoquinonespyrotechnic␣initiatorsquantum␣chromodynamicsRadishes␣and␣Gooseberryreactive␣oxygen␣speciesreciprocity␣principlesrespiratory␣bronchiolerespiratory␣therapistsreticulohistiocytomasreticulohistiocytosesreticulohistiocytosisreverse␣hyperextensionrevolving-door␣syndrome revolving␣door␣syndromerhamnopolysaccharidesrides␣the␣cotton␣bicycleRocky␣Mountain␣Kool-Aidsrole-playing␣video␣gamesRome␣wasn't␣burned␣in␣a␣dayrotary␣printing␣pressesRussell-Silver␣syndromeSainte␣Genevieve␣CountySan␣Joaquin␣Valley␣feverscaly-breasted␣lorikeetscientific␣methodologysclerochronologicallyscreaming␣bloody␣murdersecondary␣fermentationsecond␣impact␣syndromessee␣you␣in␣the␣funny␣pagesseleniuretted␣hydrogenshallow␣brooks␣are␣noisyShipton-by-BeningbroughShockley-Queisser␣limitshort␣twentieth␣centuryshunting-yard␣algorithmsialylglycoconjugatessialyloligosaccharidesilane-modified␣polymerSilver-Russell␣syndromesing␣from␣the␣same␣hymnal

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 490 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 55 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 35 words

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