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There are 528 eighteen-letter words containing G, I, O, S and Y

(page 4)

sialylglycopeptidesialylglycopolymersialylglycoproteinsigillographicallysignature␣authoritySir␣Roger␣de␣CoverleySir␣Roger␣of␣Coverleysleeping␣dictionarysling␣psychrometerssocial␣anthropologysocial␣psychologiessociochronobiologysocioendocrinologysociopragmaticallysociopsychologicalsociopsychologistssonosalpingographyspectrographicallyspectroheliographysphingoglycolipidsstanding␣on␣ceremonystand␣on␣one's␣dignitystaphylinidologiststeganographicallySte.␣Genevieve␣Countystew␣in␣one's␣own␣gravystinking␣corpse␣lilystorage␣hypervisorsstrawberry␣begoniasstrongylocentrotidSt␣Totteringham's␣Daystylohyoid␣ligamentsublogarithmicallysucking␣donkey␣ballssulfoglycopeptidessummary␣proceedingssuperagonisticallysuperphysiologicalsupraphysiologicalsurface␣etymologiessuspensory␣ligamentsympathoadrenergicsyncategorematicalsynchronized␣divingsyringohydromyeliasystems␣programmingtephrostratigraphythermophysiologiesthioglycosylationsthough␣I␣say␣so␣myselfthrombocytogenesistight␣pants␣syndromeTommy␣John␣surgeriestonsillopharyngealtouring␣motorcyclestransglucosylatingtransglucosylationtransglycosidationtransglycosylatingtransglycosylationtranshydrogenation trans-hydrogenationtrichostrongyloidstrichostrongylosistrimethylguanosinetwo␣can␣play␣this␣gameultrasonologicallyunantagonisticallyundecylprodigiosinunderglycolysationunderglycosylationustilaginomycetousvestibulolinguallyveterinary␣surgeonsvideolaryngoscopes video␣laryngoscopesvideolaryngoscopicwearing␣too␣many␣hatswhisky␣tango␣foxtrotWilliamsburg␣CountyWinter␣Olympic␣GamesX-ray␣absorbing␣glassyellow␣bristle␣grassyellow-eyed␣penguinsyou␣can␣say␣that␣againyouth␣organizationsyttrium␣iron␣garnetsyucking␣someone's␣yumzygomaticosphenoidzygomatic␣processes

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 411 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 47 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 28 words

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