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There are 52 eighteen-letter words containing I, 3O, R, S and X

baritone␣saxophonesboxing␣someone's␣earscarboxyfluorosceincarboxyhemoglobinschloroethoxyaminescofactor␣expansionscopy-on-write␣proxiescounterexpositionscounterorthodoxiescytotoxic␣reactionsdeoxyfluorinationsdeoxyriboaldolasesdeoxyribofuranosesdextrocycloversionexoribonucleolysisexterosensorimotorhalohydroxylationshomogeneous␣mixturehydroalkoxylationshydroperoxidationshydroperoxylationshydroxycarotenoidsichthyosarcotoxinsichthyosarcotoxismknock␣someone␣for␣sixMissouri␣Fox␣Trottermitochondriotoxinsmonohydroperoxidesmonohydroxylationsneurotoxicologistsneurotoxoplasmosisnonaggression␣axiom non-aggression␣axiomoligocellodextrinsopening␣Pandora's␣boxOriental␣Orthodoxesoverapproximations over-approximationsoverextrapolationsparadoxes␣of␣fictionperoxodiphosphatesphotoperoxidationsproofs␣by␣exhaustionprototype␣extensionproximoposteriorlysopranino␣saxophonesoprano␣saxophonistsoprillo␣saxophonestext␣door␣neighboursthromboprophylaxistoxic␣shock␣syndromewhisky␣tango␣foxtrot

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 41 words
  • Spanish Wiktionary: 4 words
  • Italian Wiktionary: no word
  • German Wiktionary: 4 words
  • Portuguese Wiktionary: 3 words
  • Dutch Wiktionary: 3 words

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