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There are 926 eighteen-letter words containing I, L, O, S, T and Y

(page 5)

physiopathologicalphysiopathologistsphytomorphologistsphytophysiologicalphytoplanktivorousphytostabilisationphytostabilizationpiperonylonitrilespiss␣money␣up␣the␣wallPittsylvania␣Countyplastohydroquinoneplaying␣Nostradamusplay␣one's␣cards␣rightplays␣one's␣hand␣rightplay␣well␣with␣othersplay␣with␣edged␣toolsplay␣with␣house␣moneyplethysmographicalpoikiloblasticallyPoland␣Is␣Not␣Yet␣Lostpolicy␣interest␣ratepolyacrylonitrilespolychemotherapiespolychromatophilespolydispersibilitypolydispersivitiespolyesterificationpolyethyleneiminespolyfunctionalisedpolygamma␣functionspolymerizabilitiespolymerogenicitiespolymolecularitiesPolynesian␣Trianglepolysomnographistspolysporangiophytepolyvictimizationspopular␣etymologiespopulation␣pyramidsportal␣hypertensionpositional␣asphyxiapositive␣neutralitypostconceptionallypostdepositionallypostdiagnosticallypostfoundationallypostlinguisticallypostpolymerizationpostpsychoanalyticpostranslationallypotassium␣guanylatepotentiostaticallyprecompositionallyprecrystallizationpredispositionallyprephosphorylatingprephosphorylationpresuppositionallypresymptomaticallyprimary␣legislationprobability␣densityprobability␣measurepropagandisticallyproposition␣playersprosperity␣theologyproteoaminoglycansprotocycloceratidsprotodesilylationsprotomicrocotylidsprotomyofibroblastprotoplanetary␣discprotoplanetary␣diskprotopsychologicalprotopsychologistsproximoposteriorlypseudoanaphylacticpseudoetymologicalpseudoheritabilitypseudoleukocytosispseudometaphysicalpseudomythologicalpseudopolycythemiapseudouridylationspsychoacousticallypsychoanalyticallypsychocivilizationpsychodermatologicpsychodramaticallypsychographologistpsychohistoricallypsycholinguisticalpsychologisticallypsychomanipulationpsychomanipulativepsychoneurologistspsychoneuroticallypsychopathologicalpsychopathologistspsychopathologizedpsychopathologizespsychophoneticallypsychophysiologistpsychoprophylacticpsychosemanticallypsychosemioticallypsychosociologistspsychostimulationspsychotechnologiesPyrénées-OrientalespyroglutamylationspyrophosphorolyticpyrophosphorylyticpyropoikilocytosisPythagorean␣triplesqualifying␣positionreconstitutabilityreconstructabilityreconstructibilityrecrystallisationsrecrystallizationsreductionisticallyrelational␣antonymsrenohistopathologyrephosphorylationsrepresentationallyresolution␣advisoryrestoration␣ecologyresyllabificationsreticulated␣pythonsreticulocytopeniasretinovasculopathyretransformabilityretrophylogenomicsretrosyntheticallyribosyltransferaserotational␣symmetryRoyal␣Leamington␣Sparoyal␣straight␣flushsalpingovariectomyscheduled␣territoryschizoanalyticallySchnitzler␣syndromeschool␣psychologistsecessionisticallysecondary␣liabilitysedimentologicallyselenoalkoxylationsemiapologeticallysemicerebellectomy

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 537 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 63 words
  • Portuguese Wiktionary: 1 word
  • Dutch Wiktionary: 27 words

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