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There are 39 twenty-one-letter words containing C, O, S, U and X

autolyzed␣yeast␣extractChannel-Port␣aux␣Basquescompetitive␣exclusionscyclodeoxynucleosidesdeoxyoligonucleotidesdeoxyribonucleotidasedesoxyoligonucleotidedesoxyribonucleic␣aciddesoxyribonucleolyticdesoxyribonucleosidesdesoxyribonucleotidesdicyclohexylammoniumsdideoxyribonucleosidedihydroxysuccinic␣aciddumber␣than␣a␣box␣of␣rocksEastern␣Orthodox␣Churchendodeoxyribonucleaseexclusive␣disjunctionsexecutive␣ego␣functionsexodeoxyribonucleasesexopolygalacturonasesexternal␣oblique␣muscleextraconstitutionallyhexachlorofluoresceinhydroxyethylcelluloseinternal␣carotid␣plexusloncastuximab␣tesirineneuropsychotoxicologyoligodeoxynucleotidesoligodesoxynucleotideoxyfunctionalizationsparadoxical␣undressingrunning␣for␣the␣exerciseRussian␣Orthodox␣ChurchSerbian␣Orthodox␣Churchsuck␣all␣the␣oxygen␣out␣ofsuxamethonium␣chloridetauroursodeoxycholateWitherspoon-excludable

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 137 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 4 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 7 words

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