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There are 551 eighteen-letter words containing A, C, H, I, S and Y

(page 3)

lymphoplasmacytoidlymphoplasmocytoidlymphoscintigraphylypopolysaccharidemacrohaemodynamicsmacrophysiologicalmagnetohydrostaticmagnetosphericallymechanical␣laryngesmechanical␣larynxesmechanosensitivitymechanostimulatorymedicinal␣chemistrymesenchymalisationmesenchymalizationmesopolysaccharidemetempsychoticallymicrohaemodynamicsmicrohydrodynamicsmicrohymenopteransmicrolissencephalymicrophanerophytesmicrophysiologicalMilankovitch␣cyclesmissynchronizationmonopisthocotyleanmorphosemanticallymorphosyntacticianmoved␣the␣yardsticksmoves␣the␣yardsticksmucopolysaccharidemycobacteriophagesmyeloarchitecturesmyocardiodystrophyneedles␣in␣a␣haystackneedles␣in␣haystacksneoglyphioceratidsneoichthyosauriansneurophysiologicalneuropsychiatristsneuropsychodynamicneuropsychologicalneuropsychopathiesnice␣guys␣finish␣lastnonmechanisticallynonphilosophicallynonphysiologicallynonpolysaccharidesnormophysiologicalnotoryctemorphiansnot␣while␣pussy's␣a␣catoctadehydrocorrinsopsonophagocytosisopsonophagocytoticorthopsychiatristsoscillographicallyovariohysterectomypachycephalosauridpachypleurosauridspachyrhizodontoidspaedopsychologicalpaedopsychologistspalaeobiochemistrypalaeogeochemistrypaleoichthyologistpaleophysiologicalpaleopsychologicalparasympatholyticspathophysiologicalpathopsychologicalpatristic␣anthologypersonality␣clashesphanerocrystallinephantasmagoricallypharmacophysiologypharmacopsychiatrypharmacoresistancypharyngobranchialsphenylboronic␣acidsphenylchlorosilanePhilly␣cheesesteaksphosphoacetylationphosphorocyanidatephosphorylceramidephosphorylcreatinephotophysiologicalphotoswitchabilityphotosyntheticallyphyletic␣gradualismphylostratigraphicphylotranscriptomephysical␣distancingphysical␣geographerphysical␣quantitiesphysical␣therapistsphysician␣assistantphysician␣extendersphysicochemicalismphysicomathematicsphysicotheologicalphysiogeographicalphysiopathologicalphytophysiologicalPiccadilly␣butchersplay␣one's␣cards␣rightplays␣with␣a␣full␣deckplay␣the␣dickens␣withplethysmographicalpolychemotherapiespolychromatophilespolyhydric␣alcoholspolypharmacologiespolyphosphoric␣acidpolysomnographicalpostpsychoanalyticpreanaestheticallypresynchronizationprosopographicallyprotopsychologicalpseudoanaphylacticpseudometaphysicalpseudomythologicalpseudopolycythemiapseudopsychopathicpsychic␣photographypsychoacousticallypsychoacousticianspsychoanalyticallypsychobiographicalpsychobiologicallypsychocivilizationpsychocosmologicalpsychodermatologicpsychodramaticallypsychogeographicalpsychogeriatricianpsychographologistpsychohistoricallypsycholinguisticalpsychological␣slipspsychologisticallypsychomanipulationpsychomanipulativepsychoneurologicalpsychoneuroticallypsychopathologicalpsychopathologistspsychopathologizedpsychopathologizespsychopharmaceuticpsychophonetically

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 535 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 84 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 24 words

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