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There are 27 eighteen-letter words containing I, N, S, T and 3U

continuous␣functioncounterculturalismcounterculturalistcultural␣diffusionsGaussian␣curvaturesin␣puris␣naturalibusinput-output␣sectioniron-sulfur␣clustersiron-sulphur␣clustermultisubstitutionsmusculoaponeuroticmusculoligamentousmutual␣masturbationpaucituberculatansquantum␣ferrofluidsquantum␣spin␣liquidsSan␣Augustine␣Countyseminiferous␣tubulespin␣quantum␣numberssquirting␣cucumberssupercounterfluidsTriangulum␣Australetubulointerstitiumuncinate␣fasciculusundisputatiousnessunsubstitutabilityunsupernaturalized

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 104 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 72 words
  • Portuguese Wiktionary: 5 words
  • Dutch Wiktionary: 15 words

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