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There are 335 twenty-letter words containing I, N, O, P, R, T and Y

(page 3)

pyrotechnic␣initiatorPythagorean␣trianglesRaman␣optical␣activityreciprocity␣principlerepresentation␣theoryrhythmic␣contemporaryright␣up␣someone's␣alleyroentgenographicallysalpingo-oophorectomyschlieren␣photographyscinticisternographysecondary␣hypothermiasecond␣impact␣syndromeShipton-under-Wychwoodsinapoyltransferasessocial␣responsibilitySouthern␣lady's␣slipperspecial␣unitary␣groupsspectropotentiometryspiny␣softshell␣turtlespondylarthropathiesspondyloarthropathicspondylotherapeuticsstereocinematography stereo-cinematography stereo␣cinematographystrongylophthalmyiidsulfamethoxypyrazinesuperextraordinarilysupermanoeuvrabilitysupersymmetrizationssymmetric␣polynomialssympathetic␣vibrationsynaptoarchitecturessynchronisation␣proxysynchronization␣proxysyncytiotrophoblastssynergohymenotrophicsyngenesiotransplantTaeniopteryx␣nebulosatalk␣like␣an␣apothecarytectonic␣keratoplastytetrachlorobiphenylstetrahydropyrimidinetetrahydrothiophenestetraphenylarsoniumstetrazolopyrimidinesthioglucopyranosidesthiophosphorylationstranscardiopulmonarytransphosphorylatingtransphosphorylationtribopolymerizationstriphenylphosphoniumtriphenyltetrazoliumturnip-rooted␣parsleystychoparthenogenesistychoparthenogeneticultraphytoplanktonicultrasonographicallyuniversal␣opportunityuniversity␣professorsvery␣important␣personsvideonystagmographicwhite-gaped␣honeyeaterwindows␣of␣opportunityYangtze␣River␣dolphinsyinpterochiropterans

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 225 words
  • Spanish Wiktionary: 4 words
  • Italian Wiktionary: no word
  • German Wiktionary: 13 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 11 words

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