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There are 62 eighteen-letter words containing F, 2I, N, O and 2U

aequihymeniiferousargilloferruginousautotransfusionistbiodesulfurizationbituminosulfonatesBrillouin␣functionsconfuciusornithidscontinuous␣functioncounterinfluencingcruisin'␣for␣a␣bruisin'cultural␣diffusionsdouble␣first␣cousinsexecutive␣functionsfibrinosuppurativeflourodeoxyuridinefluorodeoxyuridinefluoroimmunometricfour-minute␣warningsfunction␣multiplierhydrodesulfurizingimmunodysfunctionsimmunofluorimetricimmunofluorometricimmunoinsufficientimmunopurificationinclusion␣functionsinferior␣colliculusinfundibuliformityiron-sulfur␣proteinsjury␣nullificationslabium␣inferius␣orisluminiferous␣aetherluminosity␣functionmalfunction␣routinemicromanufacturingmultibiofunctionalmulticonfigurationmultifariousnessesmultifunctionalisemultifunctionalitymultifunctionalizemutual␣informationsplurifunctionalityPortuguesificationquadratic␣functionsrecursive␣functionsRepublic␣of␣SurinameRuffini's␣corpusclesselfubiquitinationseminiferous␣tubulespurious␣infectionssucking␣the␣air␣out␣ofsulfidoleukotrienesurjective␣functiontrimethylsulfoniumtrisulfoaluminatestuberoinfundibularunderqualificationUnion␣of␣South␣Africauntil␣further␣noticeunwhipped␣of␣justicevaluation␣functions

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 102 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: 1 word
  • German Wiktionary: 33 words
  • Portuguese Wiktionary: 2 words
  • Dutch Wiktionary: 3 words

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