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32 words ending with ns, 19 letters long

bourgeoisifications chlorofluorocarbons counterinstitutions counterreformations counterretaliations disproportionations electrodesiccations establishmentarians evapotranspirations hyperconcentrations hypersensitizations intercommunications microencapsulations overcapitalizations overcentralizations overclassifications overgeneralizations overidentifications overinterpretations overrepresentations oversimplifications overspecializations ovolactovegetarians photodecompositions photosensitizations phytohemagglutinins polyesterifications proletarianizations sentimentalizations territorializations transmogrifications transubstantiations