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There are 65 twenty-one-letter words containing I, K, O, 2R and 2S

alkylhydroperoxidasesAustralian␣as␣a␣kangarooBjelovarsko-bilogorskablack␣over␣Bill's␣mother'sbreaking␣someone's␣heartBroken␣Glass␣RepublicanBruton's␣tyrosine␣kinaseCentral␣Asian␣Ovcharkascommon␣squirrel␣monkeysdark␣crimson␣underwingsdisembarkment␣syndromedrive␣one's␣pigs␣to␣marketEast␣Riding␣of␣Yorkshireelectroshock␣therapieserrors␣of␣the␣second␣kinderythroleukemogenesisFrankenstein's␣monstersgreat␣brown␣kingfishersGrothendieck␣universeshistory␣of␣the␣four␣kingsInterior␣Alaskan␣wolvesinverted␣question␣marksKarl␣Fischer␣titrationsKirchhoff's␣circuit␣lawskitchen␣sink␣regressionknights␣in␣shining␣armorKoyraboro␣Senni␣SonghaiKyasanur␣forest␣diseaseleukoerythroblastosismakes␣someone's␣hair␣curlmouse-colored␣antshrikenondiversifiable␣risks non-diversifiable␣risksnon-maskable␣interruptsNorfolk␣Island␣star␣pineNorth␣Island␣brown␣kiwisnot␣worth␣a␣tinker's␣curseoak␣processionary␣mothsParkinson-plus␣syndromepissing␣like␣a␣racehorsepiss␣more␣than␣one␣drinkspressure␣makes␣diamondsput␣a␣spanner␣in␣the␣worksRajah␣Brooke's␣birdwingsRorschach␣inkblot␣testsrufous-backed␣antvireosrufous-capped␣antshrikerufous-winged␣antshrikescaly-breasted␣lorikeetseat␣reservation␣ticketsell␣freezers␣to␣Eskimosshallow␣brooks␣are␣noisysilver-leaved␣ironbarkssold␣freezers␣to␣Eskimossouthern␣green␣stink␣bugtake␣someone's␣word␣for␣itTartarian␣honeysucklesthree␣marks␣of␣existencetoken-pasting␣operatorsTriebel-Lizorkin␣spacesVirchow-Seckel␣syndromewalking␣corpse␣syndromeWest␣Riding␣of␣Yorkshireworking-storage␣sectionYorkshire␣assimilation

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 20 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 165 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 81 words

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