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There are 873 eighteen-letter words containing I, M, S and Y

(page 5)

Olympic␣Winter␣GamesomnidimensionalityOmphalos␣hypothesisOppression␣Olympicsosteocompatibilityotomicroscopicallyovariohysterectomyovercompensatinglyoveroptimisticallyoversentimentalityoversimplisticallyoversystematicallypalaeobiochemistrypalaeogeochemistrypaleomyrmecologistpanhypopituitarismparalytic␣dementiasparasympatholyticsparatympanic␣organsParkinson's␣syndromeparliamentary␣heels Parliamentary␣heelsparsimony␣principlePennsylvania␣Germanpermanent␣residencyphantasmagoricallypharmacophysiologypharmacopsychiatrypharmacoresistancyphosphorylceramidephotoendosomolysisphotoendosomolyticphotoendosymbiontsphyletic␣gradualismphylotranscriptomephysicochemicalismphysicomathematicsphysiobiochemistryphytomorphologistsphytophysiognomiespiriformis␣syndromepiss␣money␣up␣the␣wallplaying␣Nostradamusplay␣with␣house␣moneyplethysmographicalpolybenzimidazolespolychemotherapiespolychromatophilespolyethyleneiminespolygamma␣functionspolygamomonoeciouspolymerizabilitiespolymerogenicitiespolymolecularitiespolypharmacologiespolysomnographicalpolysomnographistspolyvictimizationspopular␣etymologiespopulation␣pyramidspostcommissurotomypostpericardiotomypostpolymerizationpotassium␣guanylatepotassium␣hydroxideprecompositionallypreliminary␣rulingspresymptomaticallyprimary␣legislationprimary␣transcriptsprobability␣measurepropionylpromasineproprietary␣eponymsproteoaminoglycansprotomicrocotylidsprotomyofibroblastproximoposteriorlypseudoetymologicalpseudogynecomastiapseudohyperkalemiapseudohyponatremiapseudometaphysicalpseudomythologicalpseudoparaphylliumpseudopolycythemiapsychocosmologicalpsychodermatologicpsychodramaticallypsychomanipulationpsychomanipulativepsychopharmaceuticpsychosemanticallypsychosemioticallypsychosomatizationpsychostimulationspsychrometric␣chartpulmonary␣docimasiapulmonary␣embolismsput␣out␣of␣one's␣miserypyridylsulfoximinepyrimidodiazepinespyroglutamylationspyrophosphoramidesQuadragesima␣Sundayquasithermodynamicradiation␣chemistryradioimmunoassayedradiosynovectomiesrectosigmoidectomyrectosigmoidoscopyrelational␣antonymsreproductive␣systemrespiratory␣pigmentrespiratory␣systemsrestriction␣enzymesretransformabilityretrophylogenomicsrhamnosylglucosiderhamnosylglycosiderhythmic␣gymnasticsrotational␣symmetryRoyal␣Leamington␣Sparumination␣syndromesaccopharyngiformssalpingovariectomySandmeyer␣reactionsSanfilippo␣syndromeSchnitzler␣syndromescimitar-horned␣oryxsecondary␣emissionssecurity␣market␣lineSedgehill␣and␣Semleysedimentologicallyseismocardiographysell␣in␣May␣and␣go␣awaysemiapologeticallysemibiographicallysemicerebellectomysemicolon␣butterflysemiconservativelysemiprofessionallysemiquantitativelysemirespectabilitysemisymmetrizationsemisystematicallysialoglycopolymerssialoglycoproteomesialylglycopolymer

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 755 words
  • Spanish Wiktionary: 9 words
  • Italian Wiktionary: no word
  • German Wiktionary: 139 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 86 words

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