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There are 51 eighteen-letter words containing I, 3O, S and 2U

anonymous␣functionsautomorphism␣groupsautonomous␣vehiclesautovasoregulationblood␣substitutionsBoudouard␣reactionsconsecutio␣temporumcontinuous␣functionCosne-Cours-sur-Loirecounterconclusionscounterresolutionscounterrevolutions counter-revolutions counter␣revolutionsdelusions␣of␣doublesdiazonium␣compoundsfibrogranulomatousfluoroimmunoassaysfluoroimmunosensorfluxional␣compoundsGlorious␣RevolutionHillsborough␣Countyhomogeneous␣mixturehomogenous␣functionimmunoconjugationsimmunofluorographsinclusion␣compoundsjumps␣to␣conclusionsleucocoprineaceousmicrogranulomatousmusculoaponeuroticneuroconsciousnessneuroimmunologistsno␣show␣without␣PunchŌkuninushi-no-mikotoorthopneumovirusesorthosubstitutionsouter␣automorphismsoverobsequiousnessphotosubstitutionsProto-South␣Sulawesipseudoleukocytosispseudoneurologicalpseudoobstructionsput␣out␣of␣one's␣miseryput␣someone's␣pipe␣outQuiyoughcohannocksscapulocoracoideumstick␣one's␣tongue␣outUnion␣of␣South␣Africaviolaceous␣euphonia

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 216 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 5 words
  • Portuguese Wiktionary: 4 words
  • Dutch Wiktionary: 6 words

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