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There are 311 twenty-letter words containing I, N, O, P, R, S and Y

(page 3)

spiny␣softshell␣turtlespondylarthropathiesspondyloarthropathicspondylotherapeuticsstereocinematography stereo-cinematography stereo␣cinematographystrongylophthalmyiidsulfachlorpyridazinesulfamethoxypyrazinesummer␣penile␣syndromesuperextraordinarilysupermanoeuvrabilitysupernumerary␣rainbowsupersymmetrizationssymmetric␣polynomialssympathetic␣vibrationsynaptoarchitecturessynchronisation␣proxysynchronization␣proxysyncytiotrophoblastssynergohymenotrophicsyngenesiotransplantTaeniopteryx␣nebulosatectonic␣keratoplastytetrachlorobiphenylstetrahydrothiophenestetraphenylarsoniumstetrazolopyrimidinesthioglucopyranosidesthiophosphorylationstranscardiopulmonarytransphosphorylatingtransphosphorylationtribopolymerizationstriphenylphosphoniumturnip-rooted␣parsleystychoparthenogenesisultrasonographicallyuniversal␣opportunityuniversity␣professorsvery␣important␣personsvideonystagmographicwindows␣of␣opportunityYangtze␣River␣dolphinsyellow-crowned␣bishopsyinpterochiropterans

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 261 words
  • Spanish Wiktionary: 3 words
  • Italian Wiktionary: no word
  • German Wiktionary: 23 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 10 words

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