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There are 85 twenty-one-letter words containing H, 2O and X

acetyloxytheophyllinealkyldihydroxyacetonealkylhydroperoxidasesarbitration␣of␣exchangeAx-Grothendieck␣theorembenzoylhydroxylaminescarbomonoxyhemoglobincarboxamidomethylatedcarboxyhemoglobinemiachenodesoxycholic␣acidchlorodeoxyadenosinescholesterohydrothoraxcomplexity-hiding␣proxycontrabass␣saxophonistdibutylhydroxytoluenedichlorophenoxyaceticdicyclohexylammoniumsdihydrodesoxymorphinedihydroxyacetophenonedihydroxybenzoic␣acidsdiketospirilloxanthindimethoxyquinazolinesdimethylpolysiloxanesdumber␣than␣a␣box␣of␣rocksEastern␣Orthodox␣Churchexchanging␣of␣contractsexocellobiohydrolasesexploding␣head␣syndromeexponential␣smoothingshemihexakisoctahedronheterogeneous␣mixturesheteropolyoxometalatehexachloroantimonateshexachlorocyclohexanehexachlorocyclohexenehexachlorofluoresceinhexafluoroantimonateshexafluoroisobutylenehexafluoroisopropanolhexafluorothioacetonehexahydroxoantimonatehexatriacontanoic␣acidhydroxyanthraquinoneshydroxycorticosteroidhydroxydeoxyguanosinehydroxyergocalciferolhydroxyethylcellulosehydroxyethylrutosideshydroxyisovaleric␣acidhydroxymethylcytosinehydroxynaphthoquinonehydroxyprostaglandinsichthyoallyeinotoxismisopropylthioxanthoneJoule-Thomson␣expansionMadonna-whore␣complexesmetaxylohydroquinonesmethoxycarbonylationsmitochondrial␣matrixesneuropsychotoxicologyoctamethyltrisiloxaneonly␣Nixon␣can␣go␣to␣Chinaoperational␣exhaustionorthorhombic␣pyroxenesoxyiminocephalosporinpaleohexaploidisationpaleohexaploidizationpharmacotoxicologicalphotodecarboxylationspolydimethylsiloxanespolyhydroxyalkanoatesRussian␣Orthodox␣ChurchSerbian␣Orthodox␣Churchsopranino␣saxophonistssopranissimo␣saxophonesphenomaxillary␣fossaesuck␣all␣the␣oxygen␣out␣ofsuxamethonium␣chloridetauroursodeoxycholatetetrahydroxoberyllatetoxicopharmacologicaltriacetoxyborohydridetricyclohexylammoniumtrihydroxycholesterolWitherspoon-excludable

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 44 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 4 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 1 word

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