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There are 709 eighteen-letter words containing I, N, P, S and Y

(page 5)

small␣penis␣syndromesocial␣anthropologysodicanthophyllitesolitary␣sandpiperssonosalpingographysouthern␣yellow␣pinesphingoglycolipidsspinal␣butterfly␣rayspinycheek␣sleepersspiny-tailed␣lizardsspirocycloheptanesspirocyclopentanesspirocyclopropanessplanchnocraniallysplendid␣fairywrensspondylarthritidesspondylodysplasticspondyloepiphysealspondyloperipheralspondylotherapistsSpotsylvania␣Countystannary␣parliamentstaphylinidologiststeak␣and␣kidney␣piesSteeple␣with␣Tynehamsteganographicallystephanoberyciformstinking␣corpse␣lilystrontiopyrochloresubcompositionallysubtropical␣cyclonesuccinylproteomicssuffer␣by␣comparisonsulphinic␣anhydridesulphonic␣anhydridesummary␣proceedingssuperagonisticallysupercontractivitysuperexponentiallysuperextraordinarysuper␣high␣frequencysuperintegrabilitysupernumeraryshipssuperphenomenalitysuperpositionalitysupersubstantiallysupranutritionallysuspension␣syndromesuspensory␣ligamentSwiss␣Army␣penknivessymbolic␣expressionsympathetic␣stringssympathoactivationsympathoadrenergicsympathochromaffinsympathoexcitationsympathoinhibitionsympathoinhibitorssympathoinhibitorysymproportionationsynapticulothecatesynchiotrophoblastsynctiotrophoblastSyrian␣Arab␣Republicsystems␣programmingtake␣responsibilityTaylor's␣polynomialstenoepiphysiodesistertiary␣phosphinesthermoresponsivitythrombocytopaeniastight␣pants␣syndrometitan␣primary␣schooltonsillopharyngealtopsy-turvificationtranscriptionnallytranscriptomicallyTranshumanist␣Partytransphenomenalitytranspolyisoprenestranspyloric␣planestrialkylphosphinestriangular␣pyramidstrichlorobiphenylstrichlorodiphenylstriisopropylsilanetrimethylphosphinetrimethylpyridinestriphenylethylenestriphenylphosphanetriphenylphosphatetriphenylphosphinetriphosphorylationtrivinylphosphinestrypanosusceptibletryptophylquinonesturpentine␣of␣Cyprustwo␣can␣play␣this␣gametype␣introspectionsundecylprodigiosinundersecretaryshipunified␣type␣systemsunrepresentabilityunrepresentativelyvanity␣license␣platevelocity␣dispersionvelocity␣potentialsveterinary␣hospitalvideolaryngoscopes video␣laryngoscopesvideolaryngoscopicVietnam␣People's␣Armyvinylcyclopropanesvinylpolysiloxanesvisual␣display␣unitsWhatsApp␣UniversityWinter␣Olympic␣Gamesyellow-eyed␣penguinsyou␣can't␣polish␣a␣turdYour␣Worshipfulnesszygomaticosphenoid

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 770 words
  • Spanish Wiktionary: 10 words
  • Italian Wiktionary: no word
  • German Wiktionary: 94 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 35 words

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