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There are 162 eighteen-letter words containing A, D, 2H, 2O and S

absolute␣thresholdsadenosine␣phosphatead-hoc␣polymorphismsaminophospholipidsamphignathodontidsannihilator␣methodsantiphosphorylatedaspidorhynchiformsautophosphorylatedBaldwin's␣phosphorusbat␣for␣the␣other␣sideboardinghouse␣reachbroadshoulder␣physacame␣up␣with␣the␣goodscardiosphygmographcephalaspidomorphscephaloradiographschenodeoxycholatesChicago-style␣hot␣dogchlorohydrocarbonschlorophthalimideschondrodystrophiaschondromesenchymalcyclodecaphosphate cyclo-decaphosphatecyclodiphosphazeneDamara␣horseshoe␣batdark␣night␣of␣the␣souldehydrochlorinasesdehydrohalogenatesdephosphonylationsdephosphorylationsdiamonds␣in␣the␣roughdichlorophenarsinedihydrotachysteroldihydroxyanthronesdihydroxychalconesdiphosphoglyceratediphosphohydrolasediphosphorylationsdiphyllobothriasesdiphyllobothriasisdjadochtatherioidsdon't␣spare␣the␣horsesDorchester-on-Thamesdo␣the␣handsome␣thingdystrophinopathiesEarth␣Overshoot␣DaysechocardiographersechocardiographiesechocardiographisteuchondrocephalansFolkestone␣and␣Hytheget␣through␣one's␣headgive␣someone␣his␣headglycerophosphatidellefors␣Elkhoundshalohydroxylationshand␣someone␣his␣headhands␣someone␣his␣hatHarlan's␣ground␣slothhave␣second␣thoughtsheadless␣horsewoman Headless␣Horsewomanheadless␣horsewomen Headless␣Horsewomenheath␣spotted␣orchidheavy␣goods␣vehicleshemiphosphorylatedhexachloroiridateshexakisoctahedronshexaphosphorylatedhomopolysaccharidehousehold␣appliancehydroastrophyllitehydrochlorinationshydrohalogenationshydrophosphinationhydroxyphosphonatehydroxytryptophanshypochondroplasiashypochondroplastichypoparathyroidismhypophosphoric␣acidhypophosphorylatedhyposulphite␣of␣sodahyposulphurous␣acidisolithocholic␣acidlaughed␣one's␣head␣offlived␣in␣the␣shadow␣oflives␣in␣the␣shadow␣oflysophosphatidatesmajor␣seventh␣chordsmake␣the␣road␣shortermetaphosphoric␣acidméthode␣champenoisemonophosphorylatednaphthodianthronesnorth-northeastwardnorth-northwestwardone␣hundred␣thousandosteochondropathiaother␣days,␣other␣waysoxazaphospholidinepachyrhizodontoidspaves␣the␣road␣to␣hellperoxodiphosphatesphosphodiesterasesphosphofluoridatesphosphonodiamiditephosphonodithioatephosphoribosylatedphosphorocyanidatephosphorodiamidatephosphorodithioatephosphorothiolatedphosphorylceramidephosphosaccharidespolyhydric␣alcoholspolyphosphoric␣acidpolyphosphorylatedpseudoenophthalmospseudoexophthalmospseudohomothallismpseudophosphatasespseudophotographicpseudopsychopathicpseudorhombohedralpseudo-scholarshipspsychopathologizedpyrophosphoramidespyrophosphoric␣acidpyrophosphorylatedRichardson's␣theoremRichmond␣upon␣Thamesschool␣of␣hard␣knockssecondary␣phosphineShasta␣ground␣slothsshorthead␣redhorsessodicanthophyllitesodiumthiosulphate sodium␣thiosulphate

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 67 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 10 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 15 words

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