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There are 846 eighteen-letter words containing E, I, P, S and Y

(page 5)

proprietary␣eponymspropriosensitivityprosecution␣historyprosperity␣doctrineprosperity␣theologyproteoaminoglycansprotocycloceratidsprotodesilylationsprotoplanetary␣discprotoplanetary␣diskprototype␣extensionproximoposteriorlypseudoanaphylacticpseudobiologicallypseudoetymologicalpseudogynecomastiapseudoheritabilitypseudohyperkalemiapseudohypertensionpseudohypertrophicpseudohyponatremiapseudoleukocytosispseudometaphysicalpseudomythologicalpseudoparaphylliumpseudopolycythemiapseudopsychologiespseudopsychopathicpseudosynaesthesiapseudouridylationspseudoxyrhophiinespseudozygopleuridspsychodermatologicpsychogeographicalpsychogeriatricianpsychomanipulativepsychoneurologicalpsychoneurologistspsychoneuroticallypsychopathologizedpsychopathologizespsychopharmaceuticpsychophilosophiespsychophoneticallypsychosemanticallypsychosemioticallypsychotechnologiespsychotherapeuticspsychotherapeutistpsychrometric␣chartpsychrosensitivitypulmonary␣embolismsput␣out␣of␣one's␣miseryPyrénées-OrientalespyridylsulfoximinepyrimidodiazepinespyrophosphokinasespyrophosphoramidesPythagorean␣triplesrectosigmoidoscopyRed␣Queen␣hypothesisrefreshable␣displayrenohistopathologyrephosphorylationsrepresentationallyreproductive␣systemrespiratory␣pigmentrespiratory␣systemsreticulated␣pythonsreticulocytopeniasretinovasculopathyretrophylogenomicsrhinolaryngoscopesrides␣the␣cotton␣ponyRoyal␣Leamington␣Spasafety-deposit␣boxessalpingopharyngealsalpingopharyngeussalpingovariectomysandplay␣therapistsSanfilippo␣syndromescansoriopterygidssecondary␣phosphinesecondary␣predationsecurity␣principalssecurity␣proceduresseismocardiographysemiapologeticallysemibiographicallysemiprofessionallysemirespectabilityserendipity␣berriessialoglycopeptidessialoglycopolymerssialoglycoproteasesialoglycoproteinssialoglycoproteomesialylglycopeptidesialylglycopolymersialylglycoproteinsimple␣connectivitysince␣Skippy␣was␣a␣pupsingle-parent␣familysingle-ply␣membranessingle-speed␣bicyclesleeping␣dictionarysling␣psychrometerssmall␣penis␣syndromesocial␣psychologiessodicanthophyllitesodium␣hypochloritesolitary␣sandpiperssouthern␣yellow␣pinespectrocolorimetryspectrofluorimetryspectrographicallyspectroheliographyspectropolarimetryspinal␣butterfly␣rayspinycheek␣sleepersspiny-tailed␣lizardsspirocycloheptanesspirocyclopentanesspirocyclopropanessplendid␣fairywrensspondylarthritidesspondyloepiphysealspondyloperipheralspondylotherapistsstannary␣parliamentsteak␣and␣kidney␣piesSteeple␣with␣Tynehamsteganographicallystephanoberyciformstereospecificallystinking␣corpse␣lilystorage␣hypervisorsstrontiopyrochloresubpsychotomimeticsubtherapeuticallysubtropical␣cyclonesuccinylproteomicssuffer␣by␣comparisonsulfoglycopeptidessulphinic␣anhydridesulphonic␣anhydridesummary␣proceedings

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 1146 words
  • Spanish Wiktionary: 9 words
  • Italian Wiktionary: no word
  • German Wiktionary: 118 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 59 words

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