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There are 61 twenty-one-letter words containing A, I, L, O, S, T and X

acetylhexosaminidasesaminopolycarboxylatesaxiom␣of␣extensionalitybenzenedicarboxylatesbenzyloxyphthalimidesbox␣oneself␣into␣a␣cornerchosen-plaintext␣attackcoordination␣complexescyclohexadepsipeptidecyclomaltodextrinasesdeoxyribonucleotidasedidesmethyldoxylaminedigital␣converter␣boxesdihydroxynaphthalenesdihydroxyphenylisatindiketospirilloxanthindimethoxyquinazolinesdimethylpolysiloxanesexploratory␣committeesexponential␣smoothingsextensional␣definitionexternal␣oblique␣muscleextraconstitutionallyextragastrointestinalextrapetiolar␣stipulesextraterritorialitiesFrankenstein␣complexeshaving␣sexual␣relationshexachloroantimonateshexafluoroantimonateshexafluoroisobutylenehydroxyprostaglandinsichthyoallyeinotoxisminner␣orbital␣complexesinternal␣carotid␣plexusisopropylthioxanthoneJoule-Thomson␣expansionloncastuximab␣tesirineMaxwell␣Street␣Polishesmetaxylohydroquinonesmethoxycarbonylationsmethyltriethoxysilanemicrocrystalline␣waxesmitochondrial␣matrixesneoconvallatoxolosideoctamethyltrisiloxaneoperational␣exhaustionoxyfunctionalizationspaleohexaploidisationphotodecarboxylationspolydimethylsiloxanespterygomaxillary␣fossaRevisionist␣MaximalismRoss-Littlewood␣paradoxsocial␣anxiety␣disordersuxamethonium␣chloridetakes␣it␣to␣the␣next␣levelvinyltrialkoxysilaneswhen␣one␣least␣expects␣itWitherspoon-excludablexenotransplantability

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 148 words
  • Spanish Wiktionary: 2 words
  • Italian Wiktionary: no word
  • German Wiktionary: 7 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 2 words

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