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There are 862 eighteen-letter words containing I, L, O, R, S and Y

(page 5)

predispositionallyprephosphorylatingprephosphorylationpresuppositionallypresymptomaticallyprimary␣legislationprobability␣densityprobability␣measurepropagandisticallypropionylpromasineproposition␣playersprosopographicallyprosperity␣theologyproteoaminoglycansprotocycloceratidsprotodesilylationsprotomicrocotylidsprotomyofibroblastprotoplanetary␣discprotoplanetary␣diskprotopsychologicalprotopsychologistsproximoposteriorlypseudoheritabilitypseudohyperkalemiapseudoparaphylliumpseudouridylationspseudozygopleuridspsychobiographicalpsychodermatologicpsychodramaticallypsychogeographicalpsychographologistpsychohistoricallypsychoneurologicalpsychoneurologistspsychoneuroticallypsychoprophylacticpulmonary␣docimasiapulmonary␣embolismsPyrénées-OrientalespyridylsulfoximinepyroglutamylationspyrophosphorolysispyrophosphorolyticpyrophosphorylysispyrophosphorylyticpyropoikilocytosisPythagorean␣triplesquasisynchronouslyreconstitutabilityreconstructabilityreconstructibilityrecrystallisationsrecrystallizationsreductionisticallyrelational␣antonymsrenohistopathologyrephosphorylationsrepresentationallyresolution␣advisoryrestoration␣ecologyresyllabificationsreticulated␣pythonsreticulocytopeniasretinovasculopathyretransformabilityretrophylogenomicsretrosyntheticallyrhamnosylglucosiderhamnosylglycosiderhinolaryngoscopesribosyltransferaserosebay␣willowherbsrotational␣symmetryRoyal␣Leamington␣Sparoyal␣straight␣flushsalpingopharyngealsalpingopharyngeussalpingovariectomySanfilippo␣syndromescheduled␣territorySchnitzler␣syndromesecondary␣diagonalssecondary␣liabilitysell␣one's␣life␣dearlysemibiographicallysemicerebellectomysemicolon␣butterflysemiconservativelysemiprofessionallyserodiagnosticallyservant␣out␣of␣liverysialoglycopolymerssialoglycoproteasesialoglycoproteinssialoglycoproteomesialylglycopolymersialylglycoproteinsigillographicallySir␣Roger␣de␣CoverleySir␣Roger␣of␣Coverleyslaty␣bristlefrontssleeping␣dictionarysling␣psychrometerssmall␣penis␣syndromesocial␣anthropologysociochronobiologysocioendocrinologysociopragmaticallysodium␣hypochloritesoftware␣lifecycles software␣life␣cyclessolitary␣sandpiperssolubility␣productssonosalpingographysouthern␣yellow␣pinespectrocolorimetryspectrofluorimetryspectrographicallyspectroheliographyspectropolarimetryspirocycloheptanesspirocyclopentanesspirocyclopropanessplanchnocraniallyspondylarthritidesspondyloperipheralspondylotherapistsstakeholder␣societystationary␣bicyclesstatutory␣exclusionsteganographicallystereoisomericallystereospecificallystinking␣corpse␣lilystock␣ticker␣symbolsstoichiometricallystratificationallystrongylocentrotidstrontiopyrochlorestyrylisothiazolessublogarithmicallysubmicroscopicallysubtropical␣cyclonesuccinylproteomicssulfonic␣anhydridessulphonic␣anhydride

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 604 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 53 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 23 words

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