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There are 84 eighteen-letter words containing A, 3C, O, P and S

accident␣blackspotsacousto-optic␣effectanaphylactic␣shocksantistaphylococcalantistaphylococcicbacterioscopicallybiomicroscopicallybiophysicochemical bio-physico-chemicalcast␣up␣one's␣accountscercidiphyllaceouschapter␣of␣accidentschemical␣proteomicschemoprophylacticscholescintigraphicclassical␣computersclinical␣psychologycocrystallographiccompound␣chocolatesconcentration␣campsconceptual␣schemataconfocal␣microscopycopromicroscopicalcornucopia␣machinescorpus␣calloscotomycryphonectriaceouscyberpsychologicalcyclodecaphosphate cyclo-decaphosphatecyclostratigraphicCzochralski␣processdimercaptosuccinicechoendoscopicallyecopsychologicallyectopic␣pregnancieselectrocardioscopeelectrocardioscopyelectrotachyscopesempty␣coaching␣stockencephalocystoceleexopolysaccharidicex-tropical␣cyclonesfacies␣Hippocraticaheptacosanoic␣acidsleucocoprineaceousmacrovasculopathicmechanicoreceptorsmechanonociceptorsmercaptosuccinatesmicrolaryngoscopicmicrovasculopathicmucopolysaccharasemucopolysaccharidenarcokleptocraciesoptical␣microscopesotomicroscopicallypancreaticogastricpancreaticosplenicparacoccidioidomaspeptostreptococcalphysicochemicalismPrince␣of␣Wales␣checkprotocycloceratidspro-vice-chancellorspseudocapacitancespsychoacousticallypsychoacousticianspsychocosmologicalpsychopharmaceuticpsychoprophylacticpsychosociologicalpsychrometric␣chartscapulocoracoideumsociopsychologicalsomaticosplanchnicspace␣communicationstaphylococcicidalsubdolichocephalicsubmicroscopicallysubtropical␣cyclonesulphocarbonic␣acidtachistoscopicallytechnocapitalisticultramicroscopical

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 24 words
  • Spanish Wiktionary: 5 words
  • Italian Wiktionary: 7 words
  • German Wiktionary: no word
  • Portuguese Wiktionary: 2 words
  • Dutch Wiktionary: 7 words

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