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31 words ending with on, 18 letters long

antiadministration antidiscrimination bourgeoisification chlorofluorocarbon counterinstitution counterreformation counterretaliation disproportionation electrodesiccation evapotranspiration hyperconcentration hypersensitization intercommunication microencapsulation overcapitalization overcentralization overclassification overgeneralization overidentification overinterpretation overrepresentation oversimplification overspecialization photodecomposition photosensitization polyesterification proletarianization sentimentalization territorialization transmogrification transubstantiation