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There are 681 eighteen-letter words containing A, D, H and Y

(page 3)

heteroscedasticityheteroskedasticityhexacarboxylic␣acidhexadecyloxymethylhexamethyldisilanehexaphosphorylatedhide-and-die␣syndromeHimalayan␣field␣ratshistone␣deacetylasehits␣on␣all␣cylindersHollywoodificationHollywood-style␣flatHolmes-Adie␣syndromehomobasidiomyceteshomopolysaccharidehooray␣for␣HollywoodHowel-Evans␣syndromehow␣much␣do␣you␣chargehybridogeneticallyhybrid␣wave␣functionhydatids␣of␣Morgagnihydraulic␣limestonehydrazide␣hydrazonehydrencephaloceleshydroalkenylationshydroalkoxylationshydroastrophyllitehydrocarbonizationhydrocarbonylationhydrocarboxylationhydrochlorinationshydroclimatologisthydrodealkylationshydrodecyclizationhydrodemetalationshydrodeoxygenatinghydrodeoxygenationhydrodimerizationshydrodistillationshydrodynamizationshydroencephalocelehydroenvironmentalhydroflumethiazidehydrofluorinationshydrofluoroalkaneshydrofluorocarbonshydrofluosilicateshydrogencarbonates hydrogen␣carbonateshydrogenolyticallyhydrogeochemicallyhydrogravitationalhydrohalogenationshydroisomerizationhydrolaparoscopieshydromagnesiationshydrometallurgicalhydrometallurgistshydromodificationshydromorphologicalhydroperoxidationshydroperoxyflavinshydroperoxylationshydrophenoxylationhydrophosphinationhydrostatic␣balancehydrostatic␣bellowshydrostatic␣paradoxhydrostratigraphichydrosulfite␣of␣sodahydrosulfurous␣acidhydrosulphuric␣acidhydroxyadamantaneshydroxyalkylationshydroxyamphetaminehydroxybenzoic␣acidhydroxybutyric␣acidhydroxycarotenoidshydroxycyclizationhydroxyderivativeshydroxyhalolactonehydroxyiodolactonehydroxylbastnäsitehydroxymaprotilinehydroxymetaboliteshydroxymethylationhydroxynaphthalenehydroxyperoxidaseshydroxyphosphonatehydroxypyruvic␣acidhydroxystearic␣acidhydroxytryptamineshydroxytryptophanshydroxywithanolidehyperacidificationhyperaldosteronismhyperaminoacidemiahyperaminoaciduriahyperandrogenaemiahyperandrogenaemichyperandrogenicityhypercitrullinatedhypercondensationshypercorticoidemiahyperdiscriminablehyperdopaminergismhyperdorsalizationhyperglyceridaemiahypergonadotropismhyperguanidinaemiahyperindividualismhypermodificationshyperpermeabilizedhypersophisticatedhypertranscendencehyperubiquitylatedhypidiomorphicallyhypoaldosteronismshypoaminoacidemiashypochondroplasiashypochondroplastichypogalactosylatedhypoparathyroidismhypophosphoric␣acidhypophosphorylatedhyposulphite␣of␣sodahyposulphurous␣acidimidazoheterocycleimmunoradiotherapyinsipid␣schizotypalJesus,␣Mary␣and␣Joseph Jesus,␣Mary,␣and␣Josephjuniper␣bush␣katydidlabyrinthectomisedlabyrinthectomizedlactodehydrogenaseland␣of␣milk␣and␣honeyland␣of␣steady␣habitslearning␣the␣hard␣wayLesch-Nyhan␣syndromeleucoanthocyanidinlipopolysaccharideLlanfihangel␣YstradLlanymynech␣and␣Pantlymphadenectomisedlymphadenectomizedlymphadenomegalieslymphoplasmacytoid

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 486 words
  • Spanish Wiktionary: 2 words
  • Italian Wiktionary: no word
  • German Wiktionary: 55 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 21 words

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