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There are 46 eighteen-letter words containing E, F, 2I, S and 2U

aequihymeniiferousargilloferruginousbiodesulfurizationbituminosulfonateschrome-sulfuric␣aciddesulfitobacteriumdiesel␣exhaust␣fluiddouble␣first␣cousinsexecutive␣functionsfibrinosuppurativefine-tuned␣universesfour-minute␣warningsfucking␣like␣bunnieshydrodesulfurizingimmunoinsufficientinferior␣colliculusiron-sulfur␣proteinslabium␣inferius␣orisluminiferous␣aetherMid-Autumn␣FestivalsmultifariousnessesmultifunctionaliseparainfluenzavirusPortuguesificationpseudofolliculitispush-pull␣amplifiersrecursive␣functionsRepublic␣of␣SurinameRuffini's␣corpusclesselfubiquitinationseminiferous␣tubulespurious␣infectionssquashed␣fly␣biscuitstructural␣deficitsSturm-Liouville␣formsucking␣the␣air␣out␣ofsulfidoleukotrienesupercritical␣fluidsurjective␣functiontrimethylsulfoniumtrisulfoaluminatesTroilus␣butterfliesuncinate␣fasciculusunfinished␣businessunquantifiablenessunwhipped␣of␣justice

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 136 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: 2 words
  • German Wiktionary: 76 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 12 words

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