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There are 847 eighteen-letter words containing I, M, N, O and Y

(page 5)

nitroimidazopyransnitrosylmyoglobinsnominal␣type␣systemsnonbasidiomycetousnoncardiopulmonarynoncentrosymmetricnoncomplementaritynoncompositionallynoncompressibilitynondecomposabilitynonenvironmentallynon-Hodgkin␣lymphomanonidentity␣problemnonimmunologicallynonlogarithmicallynonmechanisticallynon-military␣servicenonpalmitoylatablenonproblematicallynonpsychotomimeticnonterminal␣symbols non-terminal␣symbolsnormophysiologicalnot␣in␣a␣million␣yearsnot␣in␣Kansas␣anymorenotoryctemorphiansnot␣Pygmalion␣likelyoctabromoporphyrinoligodendrocytomasoligohymenophoreanoligohypomenorrheaOlympic␣Winter␣GamesomnidimensionalityomnidirectionalityonomatopoieticallyOppression␣Olympicsovercompensatinglyoversentimentalityp-acetylaminophenolpalaeomagneticallypalmitoylcarnitinepanhypopituitarismpanhypoproteinemiapanhypoproteinemicparathyroid␣hormoneparatympanic␣organsParkinson's␣syndromeparsimony␣principlepentaformylgitoxinperformance␣anxietyphantasmagoricallypharmacogenotypingpharmacoresistancyphenomenologicallyphenylcarbodiimidephenyldiazomethanephenylethanolaminePhilippine␣mahoganyphotoendosomolysisphotoendosomolyticphotoendosymbiontsphotoimmunotherapyphylotranscriptomephytohemagglutininphytohemaglutininephytophysiognomiespicocyanobacteriumpink␣fairy␣armadillopiriformis␣syndromepiss␣money␣up␣the␣wallplaying␣Nostradamusplay␣with␣house␣moneypleuroperipneumonypolitical␣machinerypolybenzimidazolespolydenominationalpolydolopimorphianpolyethyleneiminespolygamma␣functionspolygamomonoeciouspolyhomonucleotidepolymerogenicitiespolynomial␣equationpolynomial␣functionpolysomnographicalpolysomnographistspolyvictimizationspopulation␣pyramidspostpolymerizationpotassium␣guanylatepotentiometricallyPottawatomie␣Countyprecompositionallyprimary␣legislationproinflammationaryprolymphangiogenicpropionylpromasineproprietary␣eponymspropylketobemidoneproteoaminoglycanspseudogynecomastiapseudohyponatremiapsychomanipulationpsychomanipulativepsychosemanticallypsychosomatizationpsychostimulationspulmonary␣docimasiapulmonary␣embolismsput␣out␣of␣one's␣miserypyrazolopyrimidinepyridinylimidazolepyridylsulfoximinepyrimidodiazepinespyrimidopyrimidinepyroelectrodynamicpyroglutamylationsquantum␣field␣theoryquantum␣immortalityquasithermodynamicquaternary␣ammoniumradiation␣chemistryradiation␣pyrometerradioimmunoassayedradioimmunotherapyradiosynovectomiesrank-nullity␣theoremrelational␣antonymsrespiratory␣pigmentrestriction␣enzymesretinohypothalamicretransformabilityretrophylogenomicsrhamnosylglucosiderhamnosylglycosideribopuromycylationRiemannian␣geometryRocky␣Mountain␣feverrotational␣symmetryround-trip␣delay␣timeRoyal␣Leamington␣Sparumination␣syndromesaccopharyngiformssalpingovariectomySandmeyer␣reactionsSanfilippo␣syndromeSchnitzler␣syndrome

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 479 words
  • Spanish Wiktionary: 4 words
  • Italian Wiktionary: no word
  • German Wiktionary: 76 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 38 words

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