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There are 641 eighteen-letter words containing E, P, R, S, T and Y

(page 4)

pseudocompensatorypseudoheritabilitypseudoheterozygouspseudohypertensionpseudohypertrophicpseudohyponatremiapseudophylactocarppseudouridylationspsychodermatologicpsychogalvanometerpsychogalvanometrypsychogeriatricianpsychoneurologistspsychoneuroticallypsychopharmaceuticpsychotherapeuticspsychotherapeutistpsychrometric␣chartpsychrosensitivityput␣out␣of␣one's␣miseryPyrénées-OrientalespyrophosphorylatedPythagorean␣triplesrape␣trauma␣syndromerasterstereographyrectosigmoidoscopyRed␣Queen␣hypothesisrenohistopathologyrephosphorylationsrepresentationallyreproductive␣systemrespiratory␣pigmentrespiratory␣systemsreticulated␣pythonsreticulocytopeniasretinovasculopathyretrophylogenomicsrheoplethysmographrides␣the␣cotton␣ponyrobs␣Peter␣to␣pay␣PaulRoyal␣Leamington␣Spasalpingovariectomysandplay␣therapistssapromycetophagousscansoriopterygidssecondary␣predationsecurity␣principalssecurity␣proceduressemirespectabilityserendipity␣berriessialoglycoproteasesialoglycoproteinssialoglycoproteomesialylglycoproteinsingle-parent␣familysleeping␣dictionarysling␣psychrometerssodium␣hypochloritesoftware␣deploymentsolitary␣sandpiperssouthern␣yellow␣pinespace-cadet␣keyboardspectrocolorimetryspectrofluorimetryspectrofluorometryspectrographicallyspectroheliographyspectromorphometryspectrophotographyspectropolarimetryspherostomatocytesspinal␣butterfly␣rayspiny-tailed␣lizardsspirocycloheptanesspirocyclopentanesspondylarthritidesspondylotherapistsspotted␣flycatchersstannary␣parliamentsteganographicallystephanoberyciformstereospecificallystereotypographersstinking␣corpse␣lilystorage␣hypervisorsstrontiopyrochloresubtherapeuticallysubtropical␣cyclonesuccinylproteomicssuperadiabaticallysuperagonisticallysupercontractivitysuperexponentiallysuperextraordinarysuperheavy␣elementssuper-heavy␣frigatessuperintegrabilitysuperiority␣complexsuperoleophobicitysuperparticularitysuperphenomenalitysuperpositionalitysuperstoichiometrysupersubstantiallysupersuperlatively super-superlativelysupersymmetricallysupplementary␣anglesupplementary␣planesupraorbital␣arterysuspensory␣ligamentsycamore␣maple␣treessympathetic␣powderssympathetic␣stringssympathoadrenergicsympathoexcitatorysymphony␣orchestrassymplectic␣matricessymplectomorphismssynaptodendrosomalsynaptodendrosomessynaptosoneurosomesystems␣programmerssystems␣programmingtake␣responsibilityTaylor-White␣processtensores␣tympanorumtephrostratigraphytertiary␣phosphinestetracyanocupratestetrahydropyrrolestetranary␣compoundstetraphenylboratestheoretical␣physicsthermokeratoplastythermophysiologiesthermoresponsivitythiophosphorylatedthiopyrophosphatesthorn-apple␣crystalsthoughts␣and␣prayersthrombelastographythrombocytopaeniasthrombocytopathiesthrombocytopoiesisthromboprophylaxestight␣pants␣syndrome

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 723 words
  • Spanish Wiktionary: 6 words
  • Italian Wiktionary: no word
  • German Wiktionary: 65 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 45 words

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