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There are 36 twenty-letter words containing H, I, M, S and X

acetylhexosaminidasearylcyclohexylaminesaugmented␣sixth␣chordsbenzylhydroxylaminesbisdemethoxycurcumindihydroxytryptaminesdimethylpolysiloxane dimethyl␣polysiloxaneexeleutherostomizingexhausted␣combinationexponential␣smoothingheterogeneous␣mixturehexamethyldisilanizehexamethyldisilazanehexamethyldisilizanehexamethyldisiloxanehydroxycinnamic␣acidshydroxymethylbilanesmethoxyhydroquinonesmonohexosylceramidesneed␣one's␣head␣examinedoligodeoxythymidinesoligodesoxythymidinephenylhydroxylaminesphysical␣examinationspolydimethylsiloxaneposthumous␣executionsscimitar-horned␣oryxesselenium␣hexafluoridesnake-in-the-box␣problemSouth␣American␣gray␣foxSouth␣American␣grey␣foxsphenomaxillary␣fossasulfamethoxypyrazinesulphamethoxydiazineuranium␣hexafluorides

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 40 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 20 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 4 words

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