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There are 29 twenty-one-letter words containing OPER

alkylhydroperoxidasesArchimedean␣propertiescapnopneumoperitoneumchief␣operating␣officercolligative␣propertiescooperative␣federalismcottage␣food␣operationsdifferential␣operatorshaemangiopericytomatahaemopneumoperitoneumhypoelliptic␣operatorsImperial␣stormtroopers Imperial␣StormtroopersLaplace-de␣Rham␣operatornoun␣substantive␣properoperational␣definitionoperational␣exhaustionpachydermoperiostosispersonal␣property␣taxespneumohemopericardiumpreoperculomandibularscrewdriver␣operationsshort-circuit␣operators short␣circuit␣operatorstoken-pasting␣operatorstrain␣operating␣companyurethroperineoscrotalvaginoperineoplastiesventriculoperitioneal

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 41 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: 2 words
  • German Wiktionary: 10 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 11 words

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