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There are 42 twenty-one-letter words containing H, O, P, T and X

acetyloxytheophyllinebenzyloxyphthalimidesChannel-Port␣aux␣Basqueschosen-plaintext␣attackcomplexity-hiding␣proxycontrabass␣saxophonistcyclohexadepsipeptidedichlorophenoxyaceticdihydroxyacetophenonedihydroxynaphthalenesdihydroxyphenylisatindiketospirilloxanthindimethoxyamphetaminesdimethylpolysiloxanesexponential␣smoothingsfirst-chance␣exceptionshepatojugular␣refluxesheteropolyoxometalatehydroxynaphthoquinonehydroxyphenethylaminehydroxyphenylpyruvatehydroxyprostaglandinsisopropylthioxanthoneJoule-Thomson␣expansionMaxwell␣Street␣Polishesmetalexicographicallymethylenedioxyphenylsneuropsychotoxicologyoperational␣exhaustionorthorhombic␣pyroxenespaleohexaploidisationpaleohexaploidizationpharmacotoxicologicalphotodecarboxylationspolydimethylsiloxanespolyhydroxyalkanoatesreverse␣hyperextensionsopranino␣saxophoniststoxicopharmacologicaltrimethoxyamphetaminewhen␣one␣least␣expects␣itWitherspoon-excludable

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 16 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 4 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 1 word

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