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There are 908 eighteen-letter words containing 2I, O, S and Y

(page 6)

schizoanalyticallyscimitar-horned␣oryxsecessionisticallysecondary␣emissionssecondary␣infectionsecondary␣intentionsecondary␣liabilitysedimentologicallyseismocardiographysemiapologeticallysemibiographicallysemiconservativelysemiprofessionallysemisymmetrizationserodiagnosticallyshoving␣it␣up␣your␣asssialoglycopeptidessialoglycoproteinssialoglycosylationsialylglycopeptidesialylglycoproteinsialyllactosaminesSiberian␣rubythroatsick␣office␣syndromesigillographicallysignature␣authoritysimple␣connectivitysix␣bob␣a␣day␣touristsskinny␣drink␣of␣watersleeping␣dictionarysocial␣psychologiessociochronobiologysocioendocrinologysociopragmaticallysociopsychologicalsociopsychologistssodicanthophyllitesodium␣borohydridessodium␣hypochloritesolitary␣sandpiperssolubility␣productssomnambulisticallySouthwick␣and␣Widleysphingoglycolipidsspondylarthritidesstandard␣of␣identitystand␣on␣one's␣dignitystaphylinidologiststaphylococcicidalstationary␣bicyclesstereoisomericallystereospecificallystinking␣corpse␣lilystoichiometricallystratificationallystylohyoid␣ligamentstyrylisothiazolessubcompositionallysublogarithmicallysubmicroscopicallysubpsychotomimeticsuccinylproteomicssulfametoxydiazinesulfonic␣anhydridessulfonylketeniminesulfosalicylic␣acidsulphonic␣anhydridesummability␣methodsSunnyside-Tahoe␣Citysuperagonisticallysupercontractivitysuperiority␣complexsuperoleophobicitysuperphysiologicalsuperpositionalitysuperstoichiometrysupranutritionallysupraphysiologicalsymbolic␣expressionsymmetric␣functionssympatheticolyticssympathicomimeticssympathoactivationsympathoexcitationsympathoinhibitionsympathoinhibitorssympathoinhibitorysymproportionationsynchronized␣diverssynchronized␣divingsyntacticosemanticsynthetic␣divisionssyringohydromyeliatachistoscopicallytake␣responsibilitytenoepiphysiodesistertiary␣phosphinesthaumatopsyllioidstheoretical␣physicsthermophysiologiesthermoresponsivitythioglycosylationsthree-dimensionallythrombocytopoiesistime␣and␣motion␣studytitan␣primary␣schooltopsy-turvificationTorne␣Valley␣Finnishtransaction␣utilitytranscriptionnallytranscriptomicallytransglycosidationtransnitrosylationtrialkylphosphinestricarboxylic␣acidstrichlorobiphenylstrichlorodiphenylstrichostrongyloidstrichostrongylosistrihexosylceramidetrihydroxystilbenetriisopropylsilanetrimethylammoniumstrimethylguanosinetrimethylphosphinetrimethylsulfoniumtriphenylphosphinetriphosphorylationtrivinylphosphinestype␣introspectionsultrabiomicroscopyunantagonisticallyunaristocraticallyuncommensurabilityunconstitutionallyundecylprodigiosinunitary␣authoritiesunjournalisticallyureterolithotripsyustilaginomycetousvasoepididymostomyvelocity␣dispersionvelocity␣potentialsvery␣special␣episodevestibulolinguallyveterinary␣hospitalvicarious␣liability

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 854 words
  • Spanish Wiktionary: 5 words
  • Italian Wiktionary: no word
  • German Wiktionary: 64 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 23 words

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