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There are 809 eighteen-letter words containing E, H, I, N, O and Y

(page 5)

parthenocarpicallypathenogeneticallypepsinhydrochloricpersonality␣clashesperturbation␣theoryphanerocrystallinepharmacogenotypingpharmacoresistancypharyngealizationspharyngoepiglotticpharyngointestinalpharyngolaryngitesphenomenologicallyphenylboronic␣acidsphenylbutanoic␣acidphenylcarbodiimidephenylchlorosilanephenyldiazomethanephenylethanolaminePhiladelphia␣CountyPhilippine␣mahoganyphiloprogenitivelyphosphatidylserinephosphoacetylationphosphorocyanidatephosphorylcholinesphosphorylcreatinephosphosensitivityphotoallergenicityphotobiotechnologyphotoendosomolysisphotoendosomolyticphotoendosymbiontsphotoimmunotherapyphotosyntheticallyphycoerythrobilinsphycoerythrocyaninphylotranscriptomephysiopathogenesisphytohemagglutininphytohemaglutininephytopathogenicityphytophysiognomiespiss␣money␣up␣the␣wallplastohydroquinoneplay␣one's␣cards␣rightplays␣one's␣hand␣rightplay␣with␣house␣moneypolitical␣machinerypolychlorobiphenylpolyendocrinopathypolyethyleneiminespolygon-circle␣graphpolyhomonucleotidepolyphenoloxidasespolyphenylalanines poly-phenylalaninespolyphenylene␣oxidepolyphthalocyaninepolysporangiophytepolyvinylchlorides polyvinyl␣chloridesporphyrinogenicityportal␣hypertensionpour␣honey␣in␣one's␣earprephosphorylatingprephosphorylationpresynchronizationprinciple␣of␣charityprolymphangiogenicproofs␣by␣exhaustionprosecution␣historyprotoanthophylliteprotoporphyrinogenpseudoanaphylacticpseudohypertensionpseudohyponatremiapseudosynaesthesiapseudoxyrhophiinespsychogeriatricianpsychomanipulativepsychoneurologicalpsychoneurologistspsychoneuroticallypsychophoneticallypsychosemanticallypsychotechnologiespsychrosensitivitypyelonephritogenicpyrophosphokinasespyrrolidinophenonePythagorean␣triplesquantum␣field␣theoryquasithermodynamicradiation␣chemistryradiculoneuropathyradioimmunotherapyrank-nullity␣theoremreality␣pornographyRed␣Queen␣hypothesisrenohistopathologyrephosphorylationsresynchronisationsresynchronizationsreticulated␣pythonsretinohypothalamicretinovasculopathyretrophylogenomicsretrosyntheticallyrhamnosylglucosiderhamnosylglycosiderhinolaryngoscopesrides␣the␣cotton␣ponysalpingopharyngealsalpingopharyngeusSchnitzler␣syndromescimitar-horned␣oryxsecondary␣phosphineSiberian␣rubythroatsignature␣authoritysling␣psychrometerssodicanthophyllitesouthern␣yellow␣pineSouthwick␣and␣Widleyspirocycloheptanesspondylarthritidesspondyloepiphysealspondyloperipheralspondylotherapistssteganographicallystephanoberyciformsticky␣shed␣syndromestrontiopyrochloreSt␣Totteringham's␣Daystylohyoid␣ligamentsulfonic␣anhydridessulphonic␣anhydrideSunnyside-Tahoe␣Citysuperphenomenalitysympathoadrenergicsympathoexcitationsynapticulothecatesynchronized␣clockssynchronized␣diverssynchronized␣divingsynthetic␣divisionssyringohydromyelia

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 696 words
  • Spanish Wiktionary: 2 words
  • Italian Wiktionary: no word
  • German Wiktionary: 81 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 27 words

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