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There are 765 eighteen-letter words containing A, I, N, O, P and Y

(page 5)

predispositionallyprephosphorylatingprephosphorylationpresuppositionallypresynchronizationprimary␣legislationPrince␣Edward␣Countyprinciple␣of␣charityprobability␣densityprobationary␣periodproinflammationaryprolymphangiogenicproofs␣by␣exhaustionpropagandisticallypropionylpromasineproposition␣playersproprietary␣eponymsproprietary␣tradingproteoaminoglycansprotoanthophylliteprotodesilylationsprotoplanetary␣discprotoplanetary␣diskpseudoanaphylacticpseudogynecomastiapseudohyponatremiapseudosynaesthesiapseudouridylationspsychoacousticianspsychoanalyticallypsychocivilizationpsychogeriatricianpsycholinguisticalpsychomanipulationpsychomanipulativepsychoneurologicalpsychoneuroticallypsychophoneticallypsychosemanticallypsychosomatizationpsychostimulationspulmonary␣docimasiapulmonary␣embolismspyranoanthocyaninspyrazolopyrimidinePynées-OrientalespyridinylimidazolepyrimidodiazepinespyroelectrodynamicpyroglutamylationspyrophosphokinasesPythagorean␣triplesqualifying␣positionradiation␣pyrometerradiculoneuropathyradioimmunotherapyreality␣pornographyrenohistopathologyrephosphorylationsrepresentationallyrespiratory␣pigmentreticulated␣pythonsreticulocytopeniasretinohypothalamicretinovasculopathyrhinolaryngoscopesribopuromycylationround-trip␣delay␣timeRoyal␣Leamington␣SpasaccopharyngiformssalpingopharyngealsalpingopharyngeussalpingoscopicallysalpingovariectomySanfilippo␣syndromescansoriopterygidssecondary␣phosphinesecondary␣predationsemiprofessionallyshoving␣it␣up␣your␣asssialoglycoproteinssialylglycoproteinsleeping␣dictionarysmall␣penis␣syndromesocial␣anthropologysodicanthophyllitesolitary␣sandpiperssonosalpingographyspirocycloheptanesspirocyclopentanesspirocyclopropanessplanchnocraniallyspondylarthritidesspondylodysplasticspondyloepiphysealspondyloperipheralspondylotherapistsSpotsylvania␣Countystaphylinidologiststeganographicallystephanoberyciformsubcompositionallysubtropical␣cyclonesuffer␣by␣comparisonsulphonic␣anhydridesummary␣proceedingssuperagonisticallysupercontractivitysuperexponentiallysuperextraordinarysuperphenomenalitysuperpositionalitysupranutritionallysuspensory␣ligamentsympathoactivationsympathoadrenergicsympathochromaffinsympathoexcitationsympathoinhibitionsympathoinhibitorssympathoinhibitorysymproportionationsynapticulothecatesynchiotrophoblastsynctiotrophoblastsystems␣programmingtake␣responsibilityTaylor's␣polynomialstertiary␣phosphinestetrahydropyridinethrombocytopaeniastight␣pants␣syndrometitan␣primary␣schooltonsillopharyngealtopsy-turvificationTouchard␣polynomialtranscriptionnallytranscriptomicallytransphenomenalitytranspolyisoprenestranspyloric␣planestrialkylphosphinestriazolopyrimidinetriisopropylsilanetrimethylolpropanetriphenylphosphanetriphenylphosphatetriphosphorylationtrypanosusceptible

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 563 words
  • Spanish Wiktionary: 3 words
  • Italian Wiktionary: no word
  • German Wiktionary: 37 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 15 words

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