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There are 129 twenty-letter words containing H, I and X

acetylhexosaminidasealkylhydroperoxidaseallohexaploidizationarylcyclohexylaminesaugmented␣sixth␣chordsbaritone␣saxophonistsbenzoylhydroxylaminebenzylhydroxylaminesbenzyloxyphthalimidebisdemethoxycurcuminBoerdijk-Coxeter␣helixbox-drawing␣characterscamphocarboxylic␣acidchenodeoxycholic␣acidchlorodeoxyadenosineciphertext-only␣attackcyclohexadienedionesdialkylhydroxylaminedichloroformaldoximedicyclohexylammoniumdiethylthioxanthonesdihydroxybenzoic␣aciddihydroxybenzylaminedihydroxynaphthalenedihydroxytryptaminesdimethoxyamphetaminedimethoxyquinazolinedimethylpolysiloxane dimethyl␣polysiloxanedioxydithiomolybdateexeleutherostomizingexercise␣for␣the␣readerexhausted␣combinationexocellobiohydrolaseexponential␣smoothingextramitochondriallyfirst-chance␣exceptionfluorohydroxyapatiteglycodeoxycholic␣acidhepatonephrotoxicityheterogeneous␣mixturehexachloroantimonatehexachloroplatinateshexadecatrienoic␣acidhexadeoxynucleotideshexafluorisopropanolhexafluoroantimonatehexafluoroplatinateshexamethonium␣bromidehexamethyldisilanizehexamethyldisilazanehexamethyldisilizanehexamethyldisiloxanehexamethylenediamine hexamethylene␣diaminehydroxyanthraquinonehydroxybenzoquinoneshydroxybenzotriazolehydroxycinnamic␣acidshydroxyethylrutosidehydroxyglutaric␣acidshydroxykenomicrolitehydroxymethylbilaneshydroxypropiophenonehydroxyprostaglandinhydroxyspheriodenonehydroxystaurosporinehydroxythioxanthonesichthyoacanthotoxinsichthyoallyeinotoxicinextinguishablenessiodochlorhydroxyquinlocal␣exchange␣carriermetaxylohydroquinonemethoxycarbonylationmethoxyhydroquinonesmethylenedioxyphenolmethylenedioxyphenylmicrolymphocytotoxicmonohexosylceramidesnear-death␣experiencesneed␣one's␣head␣examinedoligodeoxythymidinesoligodesoxythymidineOrthodox␣Christianityorthorhombic␣pyroxeneoxyhydrochlorinationperoxophosphoric␣acidphenylhydroxylaminesphosphorus␣oxynitridephotodecarboxylationphotodermatotoxicityphotomixotrophicallyphysical␣examinationspoison␣at␣the␣box␣officePolish␣Orthodox␣Churchpolydimethylsiloxaneposthumous␣executionsRademacher␣complexityradiculoplexopathiesred-billed␣leiothrixesscimitar-horned␣oryxesselenium␣hexafluoridesilylethynyloxyarenesnake-in-the-box␣problemsopranino␣saxophonistsoprillo␣saxophonistsSouth␣American␣gray␣foxSouth␣American␣grey␣foxsphenomaxillary␣fossaStixwould␣and␣Woodhallstuffing␣the␣ballot␣boxsuck␣up␣all␣the␣oxygen␣insulfamethoxypyrazinesulphamethoxydiazinesynchronisation␣proxysynchronization␣proxySyriac␣Orthodox␣Churchtake␣it␣to␣the␣next␣leveltaurodeoxycholic␣acidtauroursodeoxycholictetracontakaihexagonTexas␣spotted␣whiptailtook␣it␣to␣the␣next␣levelunextinguishablenessuranium␣hexafluoridesxeromammographicallyxeroradiographicallyxylooligosaccharides

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 137 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 59 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 6 words

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