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There are 88 eighteen-letter words containing 2I, P, R and X

administratrixshipantibioprophylaxisauxiliary␣power␣unitbisdioxopiperazinebisperoxovanadiumsBurali-Forti␣paradoxCambrian␣explosionscapital␣expenditurecarboxydipeptidasecarboxypenicillinsconsumer␣price␣indexcopy-on-write␣proxiescounterexemplifiedcounterexemplifiescounterexpositionsdeoxytylophorininedexbrompheniraminediacetoxyscirpenoldihydroxypteridinediphenylhexatrieneexecutive␣privilegeexecutive-producing executive␣producingexophthalmic␣goiterexophthalmic␣goitreexopolysaccharidicexperience␣meetingsexperimental␣designexperimentum␣crucisexplanatory␣fictionexpress␣kidnappingsextermination␣campsextradiaphragmaticextrahematopoieticextrahepatobiliaryextraphilosophicalextraphysiologicalextrascripturalityflexor␣carpi␣ulnarishydroperoxidationshydroxymaprotilinehydroxypiperidineshydroxypyrimidineshydroxypyruvic␣acidhyperextensibilityhypersexualisationhypersexualizationhyperthyroxinaemiahyperthyroxinaemichyperthyroxinemiasinferiority␣complexIrving␣the␣Explainerlexicographic␣orderMorris␣the␣Explainernicotine␣polacrilexnonlexicographicaloligooxopiperazineoverapproximations over-approximationspanexperientialismpanexperientialistpaperclip␣maximizerparadoxes␣of␣fictionpentacarbon␣dioxidepentaformylgitoxinphotoperoxidationsphysician␣extenderspolycarboxylic␣acidpotassium␣hydroxideprocess␣window␣indexproducer␣price␣indexProxima␣Centauriansproximate␣principleproximoposteriorlypseudoxyrhophiinespyridylsulfoximinereal-life␣experiencereprotoxicologicalscience␣experimentssuperiority␣complexsymbolic␣expressiontherapeutic␣indexesunderapproximating under-approximatingunderapproximation under-approximationunderexploitationsxerothermic␣periods

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 201 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 39 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 9 words

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