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There are 61 eighteen-letter words containing A, B, C, G, I, O and Y

accessory␣breathingautobiographicallybackspot␣flying␣fishbioautographicallybiochronologicallybiocrystallographybiophysiographicalbiophysiologicallybiopsychologicallybiotechnologicallybiphosphoglyceratebizygomatic␣breadthcarbonylhemoglobincarboxyhaemoglobincarboxyhemoglobinschronobiologicallycomputability␣logiccounterbalancinglycryofibrinogenemiacryoglobulinaemiascryoimmunolabelingcyanmethaemoglobincyanobacteriophagecyanomethemoglobincybercongregationscyberethnographiescyberinvestigationcyberinvestigatorscyberorganizationscyberpsychologicalcybertechnologicalCyrus–Beck␣algorithmdefining␣vocabularydiscombobulatinglydysfibrinogenaemicembryopathologicalendocytobiologicaletymological␣hybridhybridogeneticallyhyperbolic␣tangentshypercoagulabilityhyperglobulinaemicimmunobiologicallyisobolographicallyLytico-Bodig␣diseasemycobacteriologistmycobacteriophagesneuroembryologicalnonexchangeabilitypalaeomicrobiologypharyngobranchialspseudobiologicallypsychobiographicalpsychobiologicallyRepublic␣of␣Paraguaysemibiographicallysublogarithmicallysucking␣donkey␣ballsuncopyrightabilityWilliamsburg␣Countyyou␣can't␣unring␣a␣bell

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 4 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 1 word
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 2 words

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