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There are 54 eighteen-letter words containing N, 3O, S, T and X

aminocyclohexitolsbaritone␣saxophoneschenodeoxycholateschloroethoxyaminescofactor␣expansionsconvallatoxolosideconvex␣combinationscopy-on-write␣proxiescounterexpositionscounterorthodoxiescytotoxic␣reactionsdeoxyfluorinationsdextrocycloversionexecutors␣de␣son␣tortexterosensorimotorgotten␣one's␣shine␣boxhalohydroxylationshave␣got␣someone's␣sixhexafluoroacetoneshomogeneous␣mixturehydroalkoxylationshydroperoxidationshydroperoxylationshydroxycarotenoidshydroxyphosphonateichthyohaemotoxinsichthyosarcotoxinsimmunotoxicologistLaxton␣and␣MoorhousemitochondriotoxinsmonohydroxylationsneurotoxicologistsneurotoxoplasmosisoligocellodextrinsOriental␣Orthodoxesoverapproximations over-approximationsoverextrapolationsoxazolidinethionesparadoxes␣of␣fictionperoxomonosulfatesphotoperoxidationspolypseudorotaxaneproofs␣by␣exhaustionprototype␣extensionpseudoexfoliationsselenoalkoxylationsoprano␣saxophonistsuck␣the␣oxygen␣out␣ofsulfamonomethoxinetext␣door␣neighbourstoxic␣shock␣syndromewhisky␣tango␣foxtrotxanthoastrocytomas

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 35 words
  • Spanish Wiktionary: 4 words
  • Italian Wiktionary: no word
  • German Wiktionary: 5 words
  • Portuguese Wiktionary: 2 words
  • Dutch Wiktionary: 8 words

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