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There are 121 eighteen-letter words containing I, R, T, X and Y

aminohydroxylationantibioprophylaxisauxiliary␣power␣unitbinary␣indexed␣treescarboxydipeptidasecarboxymethylationcarboxyprothrombincardiocytotoxicitychloroethoxyaminescopy-on-write␣proxiescyclomaltodextrinscyclotetrasiloxanecytotoxic␣reactionsdeacetoxyscirpenoldeoxyerythronolidedeoxyfluorinationsdeoxyribonucleatesdeoxyribothymidinedeoxytylophorininedesmethoxycurcumindextrocycloversiondiacetoxyscirpenoldihydroxyanthronesdihydroxybenzoatesdihydroxypteridinediphenylhexatrieneenergy␣expendituresenterotoxigenicityexecutory␣interestsexercise␣in␣futilityexoatmosphericallyexoribonucleolyticexplanatory␣fictionextracytoplasmaticextraembryonicallyextrahepatobiliaryextraparliamentaryextraphysiologicalextrascripturalityextraterrestriallyextraterritoriallyextrathermodynamicex-tropical␣cycloneshalohydroxylationshydroalkoxylationshydrocarboxylationhydrodeoxygenatinghydrodeoxygenationhydroperoxidationshydroperoxylationshydrophenoxylationhydrostatic␣paradoxhydroxyalkylationshydroxyamphetaminehydroxybutyric␣acidhydroxycarotenoidshydroxycyclizationhydroxyderivativeshydroxyiodolactonehydroxylbastnäsitehydroxymaprotilinehydroxymetaboliteshydroxymethylationhydroxystearic␣acidhydroxytryptamineshydroxywithanolidehyperextensibilityhypersexualisationhypersexualizationhyperthyroxinaemiahyperthyroxinaemichyperthyroxinemiasichthyosarcotoxinsichthyosarcotoxisminferiority␣complexketocarboxylic␣acidlithium␣oxybutyratemethoxyeleutherinsmonohydroxylationsnanohydroxyapatitenetwork␣externalityNew␣French␣Extremitynonheterosexualityoxydehydrogenationpentaformylgitoxinperformance␣anxietypharmacotoxicologyphysician␣extenderspolycontexturalitypotassium␣hydroxidepredecarboxylationproofs␣by␣exhaustionprototype␣extensionproximoposteriorlyradiculoplexopathyscimitar-horned␣oryxsix␣bob␣a␣day␣touristsstatutory␣exclusionsuperexponentiallysuperextraordinarysuperiority␣complexsympathoexcitatorytetrahexylammoniumthiocarboxylic␣acidthromboprophylaxistoxicopharmacologytoxic␣shock␣syndrometranscarboxylationTransylvanian␣SaxonTransylvania␣Saxonstricarboxylic␣acidstrideoxynucleotidetrihexosylceramidetrihydroxybenzenestrihydroxybenzoatetrihydroxystilbeneundercarboxylationunderhydroxylationvulnerability␣indexwhisky␣tango␣foxtrotxylosylfructosides

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 48 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 9 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: no word

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