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There are 47 eighteen-letter words containing 2I, 2O, P, T and X

antibioprophylaxisantihepatotoxicityBurali-Forti␣paradoxcomplexity␣functioncopy-on-write␣proxiescounterexpositionsdecomplexificationdeoxytylophorininediacetoxyscirpenolepipodophyllotoxinexophthalmic␣goiterexophthalmic␣goitreexplanatory␣fictionextrahematopoieticextraphilosophicalextraphysiologicalhepatocytotoxicityheptaoxodisilicatehydroperoxidationshydroxymaprotilineimmunocomplexationinferiority␣complexlymphocytotoxicitynicotine␣polacrilexnonexemplificationoverapproximations over-approximationsparadoxes␣of␣fictionpentacarbon␣dioxidepentaformylgitoxinphotoperoxidationsphytophototoxicityphytotoxicologicalpositional␣asphyxiapotassium␣hydroxideproximoposteriorlypseudoexfoliationspublic␣intoxicationreprotoxicologicalsuperiority␣complexsympathoexcitationtoxicopathologicalunderapproximation under-approximationunderexploitationswith␣the␣exception␣ofxerothermic␣periods

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 48 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 8 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 3 words

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