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There are 140 twenty-one-letter words containing I, M, O, 2R, S and Y

absorption␣dynamometerabsorption␣hygrometersadrenogenital␣syndromeadsorption␣calorimetryaminoacyltransferasesAndean␣hairy␣armadillosatomic␣force␣microscopyBerk-Tabatznik␣syndromecardioparasympatheticcardiovascular␣systemscatastrophic␣mortalityChiari-Frommel␣syndromechlorotrimethylsilanecomes␣with␣the␣territorycommon␣squirrel␣monkeyscontradictory␣antonymscoordination␣chemistryCoxeter-Dynkin␣diagramscraniopharyngiomatousCrigler-Najjar␣syndromecyclotetramerizationsdacryocystorhinostomydeacetylmarsformosidedestroyer␣minesweepersdihydrodesoxymorphinediisopropyltryptaminedisembarkment␣syndromeDunning-Kruger␣syndromeelectropolymerisationemergy␣investment␣ratioenteric␣nervous␣systemsepidemic␣polyarthritiserythrocyanosis␣crurumerythroleukemogenesisethylene␣interpolymersEuropean␣river␣lampreyseverybody␣and␣his␣mothereveryone␣and␣his␣grandmaexploratory␣committeesexternopyramidisationforeign␣accent␣syndromeforwards␣compatibilitygiving␣someone␣gray␣hairgiving␣someone␣grey␣hairglobotriaosylceramideGuillain-Barré␣syndromehepatonephric␣syndromeheteropolymerizationshistomorphometricallyhydrohemicryptophyteshypercholesterinaemiahypercholesterolaemiahypercholesterolaemichypercholesterolemiashypercholesterolemicshyperlipoproteinemiashyperparameterisationhypertestosteronaemiaintertransformabilityLanger-Giedion␣syndromeLevy-Hollister␣syndromelittle␣emperor␣syndromeLyminster␣and␣Crossbushmain␣character␣syndromemetatranscriptionallymethylthiotransferasemethyltrichlorosilanemicrocrystalline␣waxesmicroelectrochemistrymicrofluorocytometersmicroviscoamylographsmicrowave␣spectroscopymigratory␣restlessnessMillard-Gubler␣syndromemultidimensional␣arraymyocardial␣infarctionsmyristoyltransferasesoak␣processionary␣mothsoccipital␣horn␣syndromeoctahydrocurcuminoidsopen␣circulatory␣systemorganic␣brain␣syndromesorganopolymerizationsorthorhombic␣pyroxenesovariohysterectomizedpachydermoperiostosisPallister-Hall␣syndromepalmitoyltransferasesParkinson-plus␣syndromePeople's␣Liberation␣ArmypharmacopsychiatristsphotoelectrochemistryPlummer-Vinson␣syndromepopping␣someone's␣cherrypostperfusion␣syndromepotassium␣ferrocyanidePotter-Bucky␣diaphragmspreestablished␣harmony pre-established␣harmonypremenstrual␣dysphoriaprimary␣reinforcementspterygomaxillary␣fossapulmonary␣circulationspulmonary␣tuberculosisrevolving-door␣syndrome revolving␣door␣syndromerhamnopolysaccharidesRome␣wasn't␣burned␣in␣a␣dayRussell-Silver␣syndromescreaming␣bloody␣murdersecondary␣fermentationshunting-yard␣algorithmSilver-Russell␣syndromeSocial␣Democratic␣Partysocial␣security␣numbersspectrobolometricallyspinal␣muscular␣atrophystereomicroscopicallystereophotomicroscopystereospecific␣polymersupernumerary␣rainbows

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 72 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 7 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 3 words

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