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There are 589 eighteen-letter words containing D, H, I, O and Y

(page 4)

phenylbutanoic␣acidphenylcarbodiimidephenyldiazomethanePhiladelphia␣Countyphosphatidylserinephosphoglycolipidsphosphoribosylatedphosphorocyanidatephosphorylceramidephotobiomodulatoryphotocycloadditionphotodegradabilityphotoendosomolysisphotoendosomolyticphotoendosymbiontsphylobetadiversityplastohydroquinoneplay␣one's␣cards␣rightplays␣one's␣hand␣rightplay␣with␣edged␣toolspolydolopimorphianpolyendocrinopathypolyhomonucleotidepolyhydric␣alcoholspolyphenoloxidasespolyphenylene␣oxidepolyphosphoric␣acidpolyvinylchlorides polyvinyl␣chloridespotassium␣hydroxideprocardiomyopathicpseudoanaphylacticpseudoheritabilitypseudohyperkalemiapseudohypertensionpseudohypertrophicpseudohyponatremiapseudometaphysicalpseudomythologicalpseudoparaphylliumpseudopolycythemiapseudopsychologiespseudopsychopathicpseudosynaesthesiapseudoxyrhophiinespsychodermatologicpsychodramaticallypsychopathologizedpyrophosphoramidespyrophosphoric␣acidpyrrolidinophenonequantum␣field␣theoryquasithermodynamicradiation␣chemistryradiculomyelopathyradiculoneuropathyradiculoplexopathyradioimmunotherapyradiometallographyradiometeorographyRed␣Queen␣hypothesisrepeated␣bodily␣harmreticulated␣pythonsrhamnosylglucosiderhamnosylglycosiderides␣the␣cotton␣ponyscheduled␣territorySchnitzler␣syndromescimitar-horned␣oryxsecondary␣phosphineseismocardiographysodicanthophyllitesodium␣borohydridessodium␣hypochloriteSouthwick␣and␣Widleysphingoglycolipidsspondylarthritidesspondyloepiphysealspondyloperipheralspondylotherapistsstakeholder␣societystaphylinidologiststaphylococcicidalsticky␣shed␣syndromeSt␣Totteringham's␣Daystylohyoid␣ligamentsulfonic␣anhydridessulphonic␣anhydridesummability␣methodsSunnyside-Tahoe␣Citysympathetic␣powderssympathoadrenergicsynchronized␣clockssynchronized␣diverssynchronized␣divingsynthetic␣divisionssyringohydromyeliatelephone␣directorytenoepiphysiodesistetrahydridoboratetetrahydrochloridetetrahydrocortisoltetrahydropyridinetetrahydrotriazinetetraiodothyroninetetrathiomolybdatethalassochelydiansthaumatopsyllioidsthermoconductivitythermodynamic␣statethermohydrodynamicthermoinducibilitythermoradiotherapythiocarbohydrazidethiocarboxylic␣acidthiophosphorylatedthree-dimensionallythyrohyoid␣membranetight␣pants␣syndromeTouchard␣polynomialtoxic␣shock␣syndrometransendotheliallytranshydrogenation trans-hydrogenationTransylvanian␣Houndtrichlorodiphenylstrichostrongyloidstrifluorothymidinetrihexosylceramidetrihydroxybenzenestrihydroxybenzoatetrihydroxystilbeneuncharted␣territoryunderhydroxylationvectorcardiographyvinylidene␣chloridewave␣the␣bloody␣shirtwhite␣carbohydrateswithdrawal␣symptomswith␣one's␣eyes␣closedxylopolysaccharideyellow-billed␣choughyellow␣light␣of␣deathyou␣can't␣polish␣a␣turdzygomaticosphenoid

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 422 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 50 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 16 words

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