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There are 787 eighteen-letter words containing I, L, N, P and Y

(page 5)

potassium␣guanylatepotential␣vorticitypotentiometricallypotentiostaticallypreanaestheticallyprecompositionallyprecrystallizationpredecarboxylationpredeterminabilitypredispositionallypreliminary␣rulingspreoligodendrocyteprephosphorylatingprephosphorylationpresuppositionallyprimary␣legislationprinciple␣of␣charityprobability␣densityproinflammationaryprolymphangiogenicpropagandisticallypropionylpromasineproposition␣playerspropylketobemidoneproteoaminoglycansprotoanthophylliteprotodesilylationsprotoplanetary␣discprotoplanetary␣diskpseudoanaphylacticpseudouridylationspsychoanalyticallypsychocivilizationpsycholinguisticalpsychomanipulationpsychomanipulativepsychoneurologicalpsychoneurologistspsychoneuroticallypsychophoneticallypsychosemanticallypsychostimulationspsychotechnologiespulmonary␣docimasiapulmonary␣embolismspyelonephritogenicpyrazolopyrimidinePynées-OrientalespyridinylimidazolepyridylsulfoximinepyroelectrodynamicpyroglutamylationspyrrolidinophenonePythagorean␣triplesqualifying␣positionradiculoneuropathyreality␣pornographyreinterpretabilityrenohistopathologyrephosphorylationsrepresentationallyreticulated␣pythonsreticulocytopeniasretinohypothalamicretinovasculopathyretrophylogenomicsrhinolaryngoscopesribopuromycylationround-trip␣delay␣timeRoyal␣Leamington␣Spasalpingopharyngealsalpingopharyngeussalpingoscopicallysalpingovariectomysandplay␣therapistsSanfilippo␣syndromeSaturday␣night␣palsysecurity␣principalssemiprofessionallysialoglycoproteinssialylglycoproteinsignalling␣pathwayssimple␣connectivitysingle-parent␣familysingle-ply␣membranessingle-speed␣bicyclesleeping␣dictionarysling␣psychrometerssmall␣penis␣syndromesocial␣anthropologysodicanthophyllitesolitary␣sandpiperssonosalpingographysouthern␣yellow␣pinesphingoglycolipidsspinal␣butterfly␣rayspinycheek␣sleepersspiny-tailed␣lizardsspirocycloheptanesspirocyclopentanesspirocyclopropanessplanchnocraniallysplendid␣fairywrensspondylarthritidesspondylodysplasticspondyloepiphysealspondyloperipheralspondylotherapistsSpotsylvania␣Countystannary␣parliamentstaphylinidologistSteeple␣with␣Tynehamsteganographicallystinking␣corpse␣lilystrontiopyrochloresubcompositionallysubtropical␣cyclonesuccinylproteomicssulphinic␣anhydridesulphonic␣anhydridesuperagonisticallysuperexponentiallysuperintegrabilitysuperphenomenalitysuperpositionalitysupersubstantiallysupranutritionallysuspensory␣ligamentsymbolic␣expressionsynapticulothecatesynchiotrophoblastsynctiotrophoblastSyrian␣Arab␣Republictake␣responsibilityTaylor's␣polynomialstelephone␣directorytitan␣primary␣schooltonsillopharyngealTouchard␣polynomialtranscriptionnallytranscriptomicallytransphenomenalitytranspolyisoprenestranspyloric␣planestrialkylphosphinestriangular␣pyramidstriazolopyrimidinetrichlorobiphenyls

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 462 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 58 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 21 words

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