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There are 77 eighteen-letter words containing I, M, 2N, 2P and R

amidinopiperidinesaminocephalosporinaminocyclopropanesaminopropionitrileanthropomorphisinganthropomorphizingapparent␣magnitudesappointment␣diariescomparison-shopping comparison␣shoppingcomplement␣proteinscompound␣proportioncomproportionatingcomproportionationcorporal␣punishmentcylindrospermopsindiisopropanolaminedropped␣someone␣in␣itentopic␣graphomaniaEuropean␣Parliamentfront␣porch␣campaignharmonic␣proportionhomopiperonylaminehypercompensationshyperpigmentationshypsiprymnodontidsimmunoprecipitantsimmunosuppressantsimmunosuppressionsinstrument␣approachJapanese␣persimmonslumpenproletariansmaking␣an␣appearancemicrophytoplanktonminisupercomputingmonoisopropylaminemunicipal␣presidentneuroimmunopeptidenonanthropomorphicpanexperientialismpanhypoproteinemiapanhypoproteinemicparatympanic␣organsparsimony␣principlepavement␣princessespeppermint␣geraniumperiimplantationalphantom␣pregnanciespharmacogenotypingplanning␣permissionpleuroperipneumonyPont-Audemer␣Spanielpower␣of␣appointmentpræantepenultimaspreantepenultimatepresenting␣problemsprolymphangiogenicpropiomelanocortinpropionylpromasinerecess␣appointmentsresumptive␣pronounsresupplementationsSanfilippo␣syndromeSao␣Tome␣and␣Principe São␣Tomé␣and␣Príncipesupercompensationssuperenciphermentssuperimpregnationssuperphenomenalitysymproportionationturned␣into␣a␣pumpkinunderapproximating under-approximatingunderapproximation under-approximationviolent␣presumptionwhispering␣campaign

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 50 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: 8 words
  • German Wiktionary: 40 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 12 words

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