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There are 865 eighteen-letter words containing A, C, E, H, 2O and T

(page 5)

Old␣World␣flycatcheroligochaetologistsoncohaematologicaloperations␣researchopisthobranchiatesopposition␣researchopsonophagocytosedopsonophagocytosesorganotherapeuticsorthoconglomeratesorthokeratologicalorthopediatriciansorthorectificationostarioclupeomorphosteoarchaeologistosteoarcheologicalosteoarcheologistsosteoarthrectomiesosteochondroblastsosteochondromatousosteochondropathiaosteochondroplastyosteomorphologicaloutrun␣the␣constableovariohysterectomyoveraccomplishmentoverhead␣projectorsoversophisticationoxygen␣catastrophesp-acetylaminophenolpaedopsychologistspalaeobiochemistrypalaeoethnologicalpalaeogeochemistrypalaeohistologicalpalaeontographicalpalaeopathologicalpalaeopropithecidspaleochemotaxonomypaleoichthyologistpaleornithologicalpaleospinothalamicpaleotopographicalpalm␣court␣orchestrapanhypoproteinemicpentachloroanisolepentachlorobenzenepentachlorophenolspentadodecahedronspetro-dictatorshipsphacofragmentationphaeochromocytomasphaerochromocytomaphallologocentrismpharmacoeconomistspharmacogenotypingpharmacopathogenicpharmacophenotypespharmacoprotectivepharmacoproteomicspharyngoepiglotticpheochromocytomataphosphoacetylationphosphoglucomutasephosphometabolomicphosphonopentanoicphosphorocyanidatephosphorylcreatinephotoallergenicityphotochemical␣smogsphotoconceptualismphotoconceptualistphotocrosslinkablephotodecolourationphotodeconjugationphotodocumentariesphotodocumentationphotoelectroactivephotoelectrographsphotoencapsulationphotofunctionalizephotographic␣memoryphotographic␣papersphotographic␣platesphotokeratectomiesphotomicrographersphotoprecipitationphotorecombinationphotosyntheticallyphototherapeuticalphotothermoplasticphotovoltaic␣effectphycoerythrocyaninphylotranscriptomephysicotheologicalphytopathogenicityplainclothespersonPointe␣Coupee␣Parishpolychemotherapiespolychromatophilespolyendocrinopathypolyethercarbonatepolymorphonucleatepolyphthalocyaninepontomesencephalicpotassium␣chromatespotato␣chip␣of␣the␣seapreached␣to␣the␣choirpreaches␣to␣the␣choirpreatheroscleroticpresynchronizationproatherosclerosisproatheroscleroticprochaetodermatidsproteocephalideansprotocatechuic␣acidpseudoisochromaticpseudomythologicalpseudopathologicalpseudophotographicpseudophylactocarppseudopolycythemiapseudopsychopathicpseudorthoceratidspsychodermatologicpsychogalvanometerpsychogalvanometrypsychoneuroticallypsychopathologizedpsychopathologizespsychophoneticallypsychosemioticallyput␣hair␣on␣one's␣chestput␣the␣clock␣forwardraced␣out␣of␣the␣trapsraces␣out␣of␣the␣trapsradiculomyelopathyradiculoneuropathyradiculoplexopathyradiocinematographraking␣over␣the␣coalsrecatholicizationsrechromatographiesrechromatographingresidential␣schoolsresynchronisationsresynchronizationsretinohypothalamicretinovasculopathyrheofluidificationrhetorical␣question

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