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There are 1429 eighteen-letter words containing A, I, O, S and Y

(page 9)

schizoanalyticallyscimitar-horned␣oryxsecessionisticallysecondary␣diagonalssecondary␣drowningssecondary␣educationsecondary␣emissionssecondary␣infectionsecondary␣intentionsecondary␣liabilitysecondary␣phosphinesecondary␣predationsedimentologicallyseismocardiographyselenoalkoxylationsell␣in␣May␣and␣go␣awaysell␣one's␣life␣dearlysemiapologeticallysemibiographicallysemiconservativelysemiprofessionallysemisymmetrizationserodiagnosticallyservant␣out␣of␣liveryshoving␣it␣up␣your␣asssialoglycopeptidessialoglycopolymerssialoglycoproteasesialoglycoproteinssialoglycoproteomesialoglycosylationsialylglycopeptidesialylglycopolymersialylglycoproteinsialyllactosaminesSiberian␣rubythroatsigillographicallysignature␣authoritysix␣bob␣a␣day␣touristsskinny␣drink␣of␣waterslaty␣bristlefrontssleeping␣dictionarysmall␣penis␣syndromesmokestack␣industrysocial␣anthropologysocial␣psychologiessociopragmaticallysociopsychologicalsodicanthophyllitesoftware␣lifecycles software␣life␣cyclessolitary␣sandpiperssomnambulisticallysonosalpingographySouthwick␣and␣WidleyspectrographicallyspectroheliographyspectropolarimetryspirocycloheptanesspirocyclopentanesspirocyclopropanessplanchnocraniallyspondylarthritidesspondylodysplasticspondyloepiphysealspondyloperipheralspondylotherapistsSpotsylvania␣Countystakeholder␣societystandard␣of␣identitystanding␣on␣ceremonystand␣on␣one's␣dignitystaphylinidologiststaphylococcicidalstationary␣bicyclesstatutory␣authoritystatutory␣exclusionsteganographicallystephanoberyciformstereoisomericallystereospecificallystew␣in␣one's␣own␣gravystoichiometricallystorage␣hypervisorsstratificationallystrawberry␣begoniasSt␣Totteringham's␣Daystylohyoid␣ligamentstyrylisothiazolessubcompositionallysublogarithmicallysubmicroscopicallysubtropical␣cyclonesucking␣donkey␣ballssuffer␣by␣comparisonsulfametoxydiazinesulfanyloxazolinessulfonic␣anhydridessulfosalicylic␣acidsulphonic␣anhydridesummability␣methodssummary␣proceedingsSunnyside-Tahoe␣Citysuperagonisticallysupercontractivitysuperexponentiallysuperextraordinarysuperphenomenalitysuperphysiologicalsuperpositionalitysupranutritionallysupraorbital␣arterysupraphysiologicalsurface␣etymologiessuspensory␣ligamentSylvester␣equationssympatheticolyticssympathetic␣powderssympathicomimeticssympathoactivationsympathoadrenergicsympathochromaffinsympathoexcitationsympathoexcitatorysympathoinhibitionsympathoinhibitorssympathoinhibitorysymproportionationsynapticulothecatesyncategorematicalsynchiotrophoblastsynctiotrophoblastsyntacticosemanticsyringohydromyeliasystems␣of␣equationssystems␣programmingtachistoscopicallytake␣responsibilitytakes␣a␣ride␣to␣TyburnTaylor's␣polynomialsTaylor-White␣processtephrostratigraphytertiary␣phosphines

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