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There are 687 eighteen-letter words containing 2H, O, P and T

acanthocephaliasesacanthocephaliasisacenaphthoquinonesadenosine␣phosphateaethiopathologicalallenylphosphonatealphacetylmethadolalphaphotographicsaminophenanthrenesamphignathodontidsanalytic␣philosophyanaphylactic␣shocksandrohermaphroditeanilinonaphthaleneanilinophthalazineanother␣pair␣of␣shoesanthropogeographeranthropogeographicanthropomorphisinganthropomorphisticanthropomorphitismanthropomorphizinganthropomorphologyanthropomorphouslyanthropopathicallyanthropophaginiansanthroposophicallyanthropotechnologyantiphosphorylatedantischizophrenicsaphthous␣stomatitisapophthegmaticallyapplauded␣to␣the␣echoaptahistochemistryarachibutyrophobiaarchaeorthopteransastrophotographersatmospheric␣hammersautoethnographicalautophosphorylatedautophosphorylatesbacteriopheophytinbalneophototherapybathophenantrolineBhartrhari's␣paradoxbig␣white␣telephonesbiopathomechanismsbiphosphoglyceratebiphosphorylationsbisphenylthiazolesbloom␣is␣off␣the␣peachblush␣is␣off␣the␣peachbothriocephalideanbreaches␣of␣the␣peacebromsulfophthaleinbronchioepithelialbronchopneumopathycame␣up␣with␣the␣goodscarbamoylphosphate carbamoyl␣phosphatecenesthesiopathiescephalhaematocelescephalohaematomatacephalothoracopagichemicotherapeuticchemoheterotrophicchemoimmunotherapychemoorganotrophicchemoprophylacticschemostratigraphicchemosymbiotrophicchemotherapeutantschemotherapeuticalchildren's␣hospitalschip␣off␣the␣old␣blockchips␣of␣the␣old␣blockchlorarachniophytechloroacetophenonechlorophototrophicchlorophthalimideschloropyromorphitecholangiohepatitischolelithotripsiescholescintigraphicchondrodystrophiaschondrodystrophieschondrodystrophoidchorioepitheliomaschromolithographedchromolithographerchromolithographicchromophotographicchronochemotherapychronomentrophobiachronopathogenesischronophotographicchronostratigraphychronotherapeuticschucked␣up␣the␣spongecinemaphotographercoccolithophoridescome␣up␣with␣the␣goodsCoppersmith's␣methodcreatine␣phosphatescritical␣philosophycry␣from␣the␣housetopcryohypophysectomycyberethnographerscyberethnographiescyclodecaphosphate cyclo-decaphosphatecystourethrographycytohistopathologydephosphonylationsdephosphorylationsdermatopathophobiadiaminonaphthalenedihydronaphthalenedihydrothiazepinesdimethylsulphoxide dimethyl␣sulphoxidedinitronaphthalenediphenylheptanoidsdiphenylhydantoinsdiphosphoglyceratediphosphoinositidediphosphorylationsdiphyllobothriasesdiphyllobothriasisdiphyllobothriosisDoctor␣of␣Philosophydon't␣spare␣the␣horsesdystrophinopathiesechocardiographistelectrochronographelectrophotographyelephants␣in␣the␣roomelephant␣toothpasteencephalomyopathicentomophytophagousergasiophygophyteserythrocytopathieserythroenzymopathyesthesiophysiologyethnopharmacologicethnophilosophicalethnopsychiatristsethnopsychological

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