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There are 56 eighteen-letter words containing N, 3O, R, S and X

baritone␣saxophonesboxing␣someone's␣earscarboxyfluorosceincarboxyhemoglobinschloroethoxyamineschondromyxosarcomacofactor␣expansionscopy-on-write␣proxiescounterexpositionscounterorthodoxiescytotoxic␣reactionsdeoxyfluorinationsdeoxyribofuranosesdextrocycloversionexecutors␣de␣son␣tortexoribonucleolysisexterosensorimotorGoldberg-Hogness␣boxhalohydroxylationshexafluoroacetoneshomogeneous␣mixturehydroalkoxylationshydroperoxidationshydroperoxylationshydroxycarotenoidshydroxyphosphonateichthyosarcotoxinsknock␣someone␣for␣sixLaxton␣and␣Moorhousemitochondriotoxinsmonohydroperoxidesmonohydroxylationsneurotoxicologistsneurotoxoplasmosisnonaggression␣axiom non-aggression␣axiomoligocellodextrinsopening␣Pandora's␣boxOriental␣Orthodoxesoverapproximations over-approximationsoverextrapolationsparadoxes␣of␣fictionperoxomonosulfatesphotoperoxidationspolyhydroxyphenolspolypseudorotaxaneproofs␣by␣exhaustionprototype␣extensionsopranino␣saxophonesoprano␣saxophonistsoprillo␣saxophonestext␣door␣neighbourstoxic␣shock␣syndromewhisky␣tango␣foxtrotxanthoastrocytomas

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 34 words
  • Spanish Wiktionary: 3 words
  • Italian Wiktionary: no word
  • German Wiktionary: 3 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 9 words

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