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There are 42 twenty-one-letter words containing A, E, H, I, R, S and X

alkylhydroperoxidasesbenzoylhydroxylamineschlorodeoxyadenosinesdialkylhydroxylaminesdihydroxybenzoic␣acidsdihydroxynaphthalenesdihydroxyphenylisatindiketospirilloxanthindwarf␣spheroidal␣galaxyexchanging␣of␣contractsexocellobiohydrolasesexploding␣head␣syndromefirst-chance␣exceptionshaving␣sexual␣relationshemihexakisoctahedronhexachloroantimonateshexachlorofluoresceinhexafluoroantimonateshexafluoroisobutylenehexafluoroisopropanolhydroxyanthraquinoneshydroxydeoxyguanosinehydroxyisovaleric␣acidisopropylthioxanthonelocal␣exchange␣carriersMaxwell␣Street␣Polishesmetaxylohydroquinonesmethoxycarbonylationsmethyltriethoxysilanemitochondrial␣matrixesoctamethyltrisiloxaneoperational␣exhaustionoxyiminocephalosporinphotodecarboxylationsSan␣Ands␣ChicahuaxtlaSerbian␣Orthodox␣Churchserdexmethylphenidatesopranissimo␣saxophonesphenomaxillary␣fossaesuxamethonium␣chloridethree␣marks␣of␣existenceWitherspoon-excludable

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 69 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 12 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 3 words

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