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There are 50 eighteen-letter words containing F, 2I, O, S and 2U

aequihymeniiferousargilloferruginousautotransfusionistbiodesulfurizationbituminosulfonatesbowmouth␣guitarfishBrillouin␣functionschlorosulfuric␣acidchrome-sulfuric␣acidconfuciusornithidscontinuous␣functioncruisin'␣for␣a␣bruisin'cultural␣diffusionsdesulfitobacteriumdouble␣first␣cousinsexecutive␣functionsfibrinosuppurativefour-minute␣warningshydrodesulfurizingimmunodysfunctionsimmunoinsufficientinclusion␣functionsinferior␣colliculusiron-sulfur␣proteinsjury␣nullificationslabium␣inferius␣orisluminiferous␣aetherluminosity␣functionmultifariousnessesmultifunctionalisemutual␣informationsPortuguesificationpseudofolliculitisquadratic␣functionsrecursive␣functionsRepublic␣of␣SurinameRuffini's␣corpusclesselfubiquitinationseminiferous␣tubulespurious␣infectionsSturm-Liouville␣formsucking␣the␣air␣out␣ofsulfidoleukotrienesurjective␣functiontrimethylsulfoniumtrisulfoaluminatesTroilus␣butterfliesUnion␣of␣South␣Africaunwhipped␣of␣justicevaluation␣functions

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 107 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 28 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 4 words

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