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There are 89 eighteen-letter words containing C, D, 2H, 2O and P

ad-hoc␣polymorphismsapplauded␣to␣the␣echoaspidorhynchiformsbothriocephalideancame␣up␣with␣the␣goodscardiosphygmographcephalaspidomorphscephaloradiographschip␣off␣the␣old␣blockchip␣on␣one's␣shoulderchips␣of␣the␣old␣blockchlorophthalimideschlorosulpholipidschondrodystrophiaschondrodystrophieschondrodystrophoidchromolithographedcoccolithophoridescome␣up␣with␣the␣goodsCoppersmith's␣methodcyclodecaphosphate cyclo-decaphosphatecyclodiphosphazenedecachlorobiphenyldichloralphenazonedichloroindophenoldichlorophenarsinediphosphoglycerateDoctor␣of␣Philosophyechocardiographersechocardiographiesechocardiographistecohydrogeomorphiceuchondrocephalansglycerophosphatideglycophospholipidsheath␣spotted␣orchidHE-double-toothpickshomopolysaccharidehousehold␣appliancehydroencephalocelehydrolipophobicityhydromorphologicalhypidiomorphicallyhypochondrogenesishypochondroplasiashypochondroplastichypophosphoric␣acidhyposulphurous␣acidideophonographicalmetaphosphoric␣acidméthode␣champenoisemitochondriopathicosteochondropathiaosteochondrophytespachychoroidopathypachyrhizodontoidspalaeohydrographicpepsinhydrochloricphonocardiographicphosphodestructionphosphoglycolipidsphosphonucleosidesphosphonucleotidesphosphorocyanidatephosphorylceramidephosphosaccharidespolyhydric␣alcoholspolyphosphoric␣acidpreached␣to␣the␣choirprotochlorophilidepseudohypertrophicpseudoorthorhombicpseudophotographicpseudopsychopathicpseudo-scholarshipspsychopathologizedpyrophosphoric␣acidradiochromatographRichmond␣upon␣Thamessecondary␣phosphinesodicanthophyllitesodium␣hypochloritespectrodichrographsubdolichocephalicthiophosphoric␣acidtrichlorodiphenylstriphosphoric␣acidsunderchoreographed

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 40 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 8 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 7 words

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