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There are 53 twenty-one-letter words containing A, B, C, H, I, O and U

algebraic␣number␣theoryarc-hyperbolic␣functionarmoured␣combat␣vehicleautobiographicalizingbehavioural␣psychologybiohydrometallurgicalbleeding␣like␣a␣stuck␣hogbrachiocephalic␣trunksbutyrylcholinesterasecalcium␣channel␣blockercarbonaceous␣chondritecarbothermal␣reductionchannel␣of␣distributionchi-square␣distributionchloromercuribenzoatecompact␣neighbourhoodscounterestablishmentsdriven␣the␣porcelain␣busdrives␣the␣porcelain␣busduplications␣of␣the␣cubeeverybody␣and␣his␣cousingreat␣cubicuboctahedraheterobasidiomycetousheterobifunctionalityhydrostatic␣equilibriahyperbolic␣quaternionshypogammaglobulinemicJapanese␣bunching␣onionleaves␣much␣to␣be␣desiredleucoerythroblastosislike␣a␣bull␣in␣a␣china␣shopLyminster␣and␣Crossbushlymphoblastic␣leukemiamoney␣can't␣buy␣happinessneurobiopsychologicalneuropsychobiologicalNorth␣American␣wheel␣bugorthographic␣neighbourpharyngotympanic␣tubesPotter-Bucky␣diaphragmspublic-key␣cryptography public␣key␣cryptographyRepublic␣of␣South␣AfricaSecond␣Spanish␣RepublicSerbian␣Orthodox␣Churchskeleton␣in␣the␣cupboardsmall␣cubicuboctahedraSteinbach's␣crown␣cactussubstoichiometricallysupermassive␣black␣holeThompson␣submachine␣gunwhat␣do␣you␣want,␣a␣biscuitWitherspoon-excludable

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 99 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: 1 word
  • German Wiktionary: 68 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 13 words

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