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There are 79 eighteen-letter words containing 3H, O, P and R

alphaphotographicschemoheterotrophicchlorarachniophytechlorophototrophicchlorophthalimideschromolithographedchromolithographerchromolithographicchromophotographicchronochemotherapychronophotographicdihydronaphthalenediphosphohydrolaseechoencephalographheath␣spotted␣orchidhemiphosphorylatedhexachlorobiphenylhexaphosphorylatedHittorf's␣phosphorusHomberg's␣phosphorushydrophosphinationhydroxynaphthalenehydroxyphosphonatehyperglycorrhachiahyperphosphataemiahyperphosphataemichyperphosphaturiashyperphosphorylatehypophosphoric␣acidhypophosphorylatedichthyophthiriasesichthyophthiriasisichthyosauromorphsisorhynchophyllinejumped␣through␣hoopskakorrhaphiophobiakakorrhaphiophobiclight␣the␣touch-paperlithoheterotrophicnaphthodianthronesNatchitoches␣Parishnorthern␣hemisphere Northern␣Hemisphereornithocheiromorphpachychoroidopathyphosphorodithioatephosphorothioationphosphorothiolatedphosphorothiolatesphosphorus␣cachexiaphosphorylcholinesphosphosaccharidesphotochronographicphotoheterotrophicphotolithographersphotolithographingphotophosphorylasepreached␣to␣the␣choirpreaches␣to␣the␣choirpsychic␣photographyrheoencephalographrheoplethysmographrode␣with␣the␣punchesroll␣with␣the␣punchesshooting␣from␣the␣hipsouthern␣hemisphere Southern␣Hemispheretetrathiophosphatetheophilanthropismtheophilanthropistthermal␣lithospherethiophosphoric␣acidthiophosphorylatedthiopyrophosphatestrash␣heap␣of␣historytrimethylphosphinetriphenylphosphanetriphenylphosphatetriphenylphosphine

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 35 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 24 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: no word

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