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There are 35 eighteen-letter words containing H, N, P, 3T and Y

anhydroprotectantsanthropocentricityantihepatotoxicitycomputation␣historydimethyltryptamineethnopsychiatristshypercontractilityhypercontractivitymaternity␣hospitalsmethoxytryptophansnanophotocatalystsophthalmotonometrypatristic␣anthologypay␣the␣debt␣of␣natureperturbation␣theoryphotosyntheticallyphytopathogenicityphytostabilisationphytostabilizationprotoanthophyllitereticulated␣pythonsrides␣the␣cotton␣ponySteeple␣with␣Tynehamsympathetic␣stringssympathoactivationsympathoexcitationsynapticulothecatesynctiotrophoblasttetraphenylboratestight␣pants␣syndromeTranshumanist␣Partytryptophan␣synthasetwo␣can␣play␣that␣gameultraphytoplanktonwho's␣a␣pretty␣boy␣then

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 25 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 3 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 3 words

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