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There are 50 twenty-letter words containing H, O, P, T and X

allohexaploidizationbaritone␣saxophonistsbenzyloxyphthalimideciphertext-only␣attackcontrabass␣saxophonesdihydroxynaphthalenedihydroxytryptaminesdimethoxyamphetaminedimethylpolysiloxane dimethyl␣polysiloxaneexponential␣smoothingfirst-chance␣exceptionfluorohydroxyapatitegrandfather␣paradoxeshepatonephrotoxicityheptamethoxyflavoneshexachloropalladateshexachloroplatinateshexafluorophosphateshexafluoroplatinateshydroxyphenylacetatehydroxyprostaglandinhydroxystaurosporinemethoxycyclopentenesmethylenedioxyphenolmethylenedioxyphenylmicrolymphocytotoxicorthorhombic␣pyroxenephosphorus␣oxynitridephotodecarboxylationphotodermatotoxicityphotomixotrophicallyphysical␣examinationspoison␣at␣the␣box␣officePolish␣Orthodox␣Churchpolydimethylsiloxanepolyhydroxyalkanoatepolyhydroxybutyratesposthumous␣executionsRademacher␣complexityradiculoplexopathiessnake-in-the-box␣problemsopranino␣saxophonistsoprillo␣saxophonistssuck␣up␣all␣the␣oxygen␣insulfamethoxypyrazinesulphamethoxydiazinesynchronisation␣proxysynchronization␣proxyTexas␣spotted␣whiptail

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 31 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 4 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 2 words

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