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There are 72 eighteen-letter words containing B, I, S and X

algebraic␣extensionanatomical␣snuffboxantibioprophylaxisaxiomatizabilitiesbaritone␣saxophonesbarred␣spiral␣galaxyBhartrhari's␣paradoxbijoux␣problemettesbinary␣indexed␣treesbisdioxopiperazinebishydroxamic␣acidsbishydroxycoumarinbisperoxovanadatesbisperoxovanadiumsbox␣and␣whisker␣plotsbox␣and␣whiskers␣plotboxing␣someone's␣earsCambrian␣explosionscarboxydipeptidasecarboxyfluoresceincarboxyfluorosceincarboxyhemoglobinscarboxypenicillinscigar␣box␣guitaristsconvex␣combinationsdeflexibilizationsdeoxyriboaldolasesdeoxyribofuranosesdeoxyribonucleasesdeoxyribonucleatesdesoxyribonucleasedihydroxybenzoatesexoribonucleolysisexploding␣cucumbersexponential␣objectsextended␣basic␣blockextraneous␣variablegotten␣one's␣shine␣boxhappy␣as␣a␣box␣of␣birdshexabromobiphenylshydroxylbastnäsitehydroxymetaboliteshyperextensibilityiodoxybenzoic␣acidslibertarian␣Marxismlibertarian␣MarxistMexican␣bean␣beetlesmind␣your␣own␣beeswaxnonexhibitionisticopening␣Pandora's␣boxoverexcitabilitiesproofs␣by␣exhaustionpseudoexacerbationsafety-deposit␣boxesseparable␣extensionSeptember␣equinoxesSiebenbürgen␣SaxonsSiebenbürger␣Saxonssix␣bob␣a␣day␣touristssplit-complex␣numbersubmaxillary␣glandssubtextualizationssuccinocarboxamidesymbolic␣expressiontext␣door␣neighboursthromboprophylaxistraffic␣signal␣boxestranscarboxylationtricarboxylic␣acidstrihydroxybenzenestrihydroxystilbeneX-ray␣absorbing␣glass

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 118 words
  • Spanish Wiktionary: 7 words
  • Italian Wiktionary: no word
  • German Wiktionary: 15 words
  • Portuguese Wiktionary: 6 words
  • Dutch Wiktionary: 9 words

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