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There are 68 twenty-one-letter words containing H, I, X and Y

acetylhexosaminidasesacetyloxytheophyllinealkyldihydroxyacetonealkylhydroperoxidasesbenzoylhydroxylaminesbenzyloxyphthalimidescarbomonoxyhemoglobincarboxamidomethylatedcarboxyhemoglobinemiachenodesoxycholic␣acidchlorodeoxyadenosinescomplexity-hiding␣proxycyclohexadepsipeptidedialkylhydroxylaminesdibutylhydroxytoluenedichlorophenoxyaceticdicyclohexylammoniumsdidesmethyldoxylaminedihydrodesoxymorphinedihydroxyacetophenonedihydroxybenzoic␣acidsdihydroxynaphthalenesdihydroxyphenylisatindihydroxysuccinic␣aciddimethoxyamphetaminesdimethoxybenzaldehydedimethoxyquinazolinesdimethyloxalylglycinedimethylpolysiloxanesdwarf␣spheroidal␣galaxyexocellobiohydrolasesexploding␣head␣syndromehexafluoroisobutylenehexahydroxoantimonatehexamethyldisilanizedhexamethylenediamineshydroxyanthraquinoneshydroxycorticosteroidhydroxydeoxyguanosinehydroxyergocalciferolhydroxyethylrutosideshydroxyisovaleric␣acidhydroxymethylcytosinehydroxynaphthoquinonehydroxyphenethylaminehydroxyprostaglandinsichthyoallyeinotoxismisopropylthioxanthonemetalexicographicallymetaxylohydroquinonesmethoxycarbonylationsmethylenedioxyphenylsmethyltriethoxysilaneneuropsychotoxicologyoctamethyltrisiloxaneonly␣Nixon␣can␣go␣to␣Chinaorthorhombic␣pyroxenesoxyiminocephalosporinpentaethylenehexaminephotodecarboxylationspolydimethylsiloxanesreverse␣hyperextensionserdexmethylphenidatesphenomaxillary␣fossaetriacetoxyborohydridetricyclohexylammoniumtrihydroxycholesteroltrimethoxyamphetamine

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 20 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 2 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: no word

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