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There are 68 twenty-one-letter words containing 2I, O, 2S and 2U

acute␣mountain␣sicknessarctic␣ground␣squirrelsarguments␣from␣illusionarteriovenous␣fistulasAsk␣a␣Stupid␣Question␣Dayauriculares␣anterioresauriculares␣superioresaustausch␣coefficientsautonomous␣communitiesbutter␣someone's␣biscuitCarolingian␣minusculescasualty␣of␣superioritychi-square␣distributioncollective␣unconsciouscolour␣outside␣the␣linesconclusive␣presumptioncontinuing␣resolutionscounterdistinguishingcounterrevolutionistscuriouser␣and␣curiouserdistribution␣functionsDistrict␣of␣Guysboroughequipotential␣surfacesexclusive␣disjunctionsfunctional␣linguisticsGaussian␣distributionshuman␣papillomaviruseshydrodesulphurisationimmunoreconstitutionsinclusive␣disjunctionsit's␣none␣of␣your␣businessmalicious␣prosecutionsnitrosylsulphuric␣acidobstructions␣of␣justiceout␣of␣sight␣is␣out␣of␣mindoverimmunosuppressionpercussion␣instrumentspneumocystis␣pneumoniapropositional␣calculuspseudoepitheliomatouspseudointellectualismpseudomultiplicationspseudorevolutionariespunctus␣interrogativusquantum␣processing␣unitrufous-winged␣antshrikesarcoplasmic␣reticulumsimultaneous␣equationssingle-valued␣functionssocial␣insurance␣numbersocial␣security␣numberssticking␣one's␣tongue␣outStudent's␣t␣distributionsubfunctionalisationssubfunctionalizationssubstitution␣reactionssuccinylsulfathiazolesuperior␣oblique␣musclesuperior␣petrosal␣sinussuperior␣sagittal␣sinusSuperstition␣Mountainstrivial␣absolute␣valuestuberculous␣dactylitisunconstitutionalitiesuniversal␣jurisdictionuntil␣the␣last␣dog␣is␣hungyouthful␣indiscretionsYule-Simon␣distribution

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 285 words
  • Spanish Wiktionary: 3 words
  • Italian Wiktionary: no word
  • German Wiktionary: 36 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 27 words

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