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There are 58 eighteen-letter words containing 3H, 2O, P and R

alphaphotographicschemoheterotrophicchlorarachniophytechlorophototrophicchlorophthalimideschromolithographedchromolithographerchromolithographicchromophotographicchronochemotherapychronophotographicdiphosphohydrolaseechoencephalographheath␣spotted␣orchidhemiphosphorylatedhexachlorobiphenylhexaphosphorylatedHittorf's␣phosphorusHomberg's␣phosphorushydrophosphinationhydroxyphosphonatehyperphosphorylatehypophosphoric␣acidhypophosphorylatedichthyosauromorphsisorhynchophyllinejumped␣through␣hoopskakorrhaphiophobiakakorrhaphiophobiclithoheterotrophicnaphthodianthronesornithocheiromorphpachychoroidopathyphosphorodithioatephosphorothioationphosphorothiolatedphosphorothiolatesphosphorus␣cachexiaphosphorylcholinesphosphosaccharidesphotochronographicphotoheterotrophicphotolithographersphotolithographingphotophosphorylasepreached␣to␣the␣choirpreaches␣to␣the␣choirpsychic␣photographyrheoencephalographrheoplethysmographshooting␣from␣the␣hiptetrathiophosphatetheophilanthropismtheophilanthropistthiophosphoric␣acidthiophosphorylatedthiopyrophosphatestrash␣heap␣of␣history

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 33 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 18 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: no word

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