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There are 42 twenty-one-letter words containing A, C, M, 2T and 2U

acute␣mountain␣sicknessadditive␣manufacturingautonomous␣communitiesautonomous␣prefecturescomputationally␣securecomputer␣architecturescountercountermeasure counter-countermeasure counter-counter-measuredrumhead␣court-martialsenough␣to␣make␣a␣cat␣laughfunctional␣requirementhigh-functioning␣autismhuman␣leukocyte␣antigenimmunotherapeuticallyletter␣of␣countermarquemagnetic␣quantum␣numbermathematical␣structuremetal␣cluster␣compoundsmetallonutraceuticalsminimum␣sector␣altitudemultifunctional␣cookermultiplicative␣numbersmultiplicative␣numeralnatural␣numbers␣objectspremature␣ejaculationspseudointellectualismpseudomultiplicationspulmonary␣function␣testpunctuated␣equilibriumquantum␣processing␣unitspontaneous␣combustionsquad␣automatic␣weaponsstructural␣adjustmentsstructured␣programmingsupermultiplicativitysupramultiplicativelyTeichller-Tukey␣lemmatumour␣necrosis␣factorsultramicrofluorimetryumbilical␣cord␣cuttingsundocumented␣immigrant

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 92 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: 3 words
  • German Wiktionary: 32 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 12 words

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