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There are 74 eighteen-letter words containing I, 2O, P, R, T and X

antibioprophylaxisbaritone␣saxophonesbijoux␣problemettesbisperoxovanadatesbox␣and␣whisker␣plotsbox␣and␣whiskers␣plotBurali-Forti␣paradoxcarboxyprothrombincofactor␣expansionsconjugate␣redox␣paircontrol␣experimentscoordinated␣complexcopy-on-write␣proxiescorporate␣executivecounterexplanationcounterexpositionsdeacetoxyscirpenoldeoxytylophorininediacetoxyscirpenolejaculation␣praecoxexoatmosphericallyexophthalmic␣goiterexophthalmic␣goitreexplanatory␣fictionexponential␣growthsextracomputationalextracorporealizedextrahematopoieticextramorphologicalextraphilosophicalextraphysiologicalex-tropical␣cyclonesheterocomplexationhydroperoxidationshydroperoxylationshydrophenoxylationhydrostatic␣paradoxhydroxymaprotilineinferiority␣complexnanohydroxyapatiteneurosporaxanthineneurotoxoplasmosisnicotine␣polacrilexout-of-box␣experienceoverapproximations over-approximationsoverextrapolationsparadoxes␣of␣fictionpentacarbon␣dioxidepentaformylgitoxinperoxodiphosphatespharmacotoxicologyphotoperoxidationspinxterbloom␣azaleapolycontexturalitypotassium␣hydroxidepredecarboxylationproofs␣by␣exhaustionprototype␣extensionproximoposteriorlypseudoexacerbationradiculoplexopathyreprotoxicologicalsexual␣reproductionsoprano␣saxophonistsuperiority␣complexsympathoexcitatorythromboprophylaxistoxicopharmacologyunderapproximation under-approximationunderexploitationsunderextrapolationxerothermic␣periods

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 53 words
  • Spanish Wiktionary: 4 words
  • Italian Wiktionary: no word
  • German Wiktionary: 12 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 6 words

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