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There are 684 twenty-one-letter words containing A, C, O and Y

(page 3)

footloose␣and␣fancy␣freeforeign␣accent␣syndromeforwards␣compatibilityfructosyltransferasesgalactopyranosylaminegalactosylceramidasesgalactosylcerebrosidegalactosylsphingosinegalactosyltransferasegamma-aminobutyric␣acidgastroenterologicallygeometrothermodynamicgeranylgeranylacetoneglobal␣workspace␣theoryglobotriaosylceramideglottochronologicallyglucanosyltransferaseglucoronyltransferaseglucosylcerebrosidaseglucuronoarabinoxylanglucuronyltransferaseglycerophosphoric␣acidglycerophosphorylatedgo␣and␣play␣in␣the␣trafficGrand␣Duchy␣of␣Lithuaniagreat␣cry␣and␣little␣woolgyroscopic␣stabilizersgyrotrigonometricallyhaemangiopericytomataHarry␣Potter␣spectacleshave␣one's␣wicked␣way␣withhave␣the␣world␣by␣the␣neckhemilabyrinthectomieshemlock␣woolly␣adelgidshepatocarcinogenicityhepatocystic␣triangleshepatonephric␣syndromehepatopancreatobilaryheterobasidiomycetousheterobifunctionalityheteropolysaccharideshexachlorocyclohexanehexachlorocyclohexenehexaferrocenylbenzenehigh-occupancy␣vehicles high␣occupancy␣vehicleshistomorphometricallyhitting␣on␣all␣cylindershow␣can␣you␣sleep␣at␣nighthuman␣leukocyte␣antigenhydraulic␣conductivityhydroclimatologicallyhydrogen␣gas␣electrodeshydrogeomorphologicalhydrostatic␣equilibriahydroxyergocalciferolhydroxyisovaleric␣acidhyperautofluorescencehyperbolic␣polynomialshyperbolic␣quaternionshypercalprotectinemiahypercatecholaminemiahypercholesterinaemiahypercholesterolaemiahypercholesterolaemichypercholesterolemiashyperchylomicronaemiahyperhomocysteinaemiahyperhomocysteinemiashyperlipoproteinaemichyperthermoacidophilehypervascularizationshypoelliptic␣operatorshypogammaglobulinemichypoproaccelerinaemiahypoproconvertinaemiahypothalamocerebellarhysterical␣historicalsIBM␣Pollyanna␣Principleichthyoallyeinotoxismichthyoarchaeologicalichthyogeographicallyichthyoplanktologicalichthyoplanktologistsidiopathic␣hypersomniaidiosyncratic␣reactionimmunohistochemicallyimmunotherapeuticallyimprovisational␣comedyinformation␣technologyinositolphosphoglycaninstantaneous␣velocityinterjurisdictionallyinternal␣auditory␣canalinternal␣carotid␣arteryinterventionisticallyintraerythrocyticallyisostoichiometricallyjust␣another␣pretty␣faceknock␣the␣daylight␣out␣oflaryngobronchoscopieslaryngotracheomalacialeucoerythroblastosislike␣a␣kid␣in␣a␣candy␣storeLlanvihangel␣Crucorneylovely␣weather␣for␣duckslower␣respiratory␣tractLyminster␣and␣Crossbushlymphadenocarcinomatalymphangiographicallylymphoblastic␣leukemiamacroclimatologicallymacrothrombocytopeniamacrothrombocytopenicmagnetencephalographymagnetofluidodynamicsmagnetohydrodynamicalmagnetoplasmadynamicsmagnetothermodynamicsmain␣character␣syndromemajoritarian␣democracyMalecite-Passamaquoddymaleylacetoacetic␣acid

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 320 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 30 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 14 words

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