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There are 39 eighteen-letter words containing A, C, D, 2H and 2P

ad-hoc␣polymorphismsapplauded␣to␣the␣echocardiosphygmographcephalaspidomorphscephaloradiographscyclodecaphosphate cyclo-decaphosphatecyclodiphosphazenediphosphoglycerateglycerophosphatidehousehold␣appliancehypersophisticatedhypidiomorphicallyhypochondroplasiashypochondroplastichypophosphoric␣acidhyposulphurous␣acidideophonographicalmetaphosphoric␣acidpachycephalosauridpachychoroidopathypalaeohydrographicparasitaphelenchidPhiladelphia␣Countyphonocardiographicphosphorocyanidatephosphorylceramidephosphosaccharidespick␣up␣the␣threads␣ofpolyphosphoric␣acidpseudophotographicpseudopsychopathicpseudo-scholarshipspsychopathologizedpyrophosphoric␣acidsecondary␣phosphinespectrodichrographthiophosphoric␣acidtriphosphoric␣acids

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 7 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 7 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 4 words

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