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There are 30 eighteen-letter words containing I, N, O, 2P and 2U

buttoning␣up␣one's␣lipEsopus␣Spitzenburgsfibrinosuppurativehanging␣up␣one's␣spurshappy␣hunting␣groundimmunosuppressantsimmunosuppressionsimmunosuppressivesinput-output␣sectioniron-sulphur␣proteinminisupercomputersminisupercomputingneuroimmunopeptidenon-capturing␣groupsphilosophunculistspleuroperipneumonyplusquamperfectionpneumotherapeuticspulling␣one's␣socks␣uppulling␣up␣one's␣socksput␣someone's␣pipe␣outresumptive␣pronounsspurious␣diphthongssupercomputationalsuperminicomputerssupposititiousnessSussex␣pond␣puddingsturned␣into␣a␣pumpkinturpentine␣of␣Cyprusunwhipped␣of␣justice

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 71 words
  • Spanish Wiktionary: 2 words
  • Italian Wiktionary: no word
  • German Wiktionary: 17 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 6 words

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