We don't have synonyms for putrefactions yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are putrefaction, petrifactions and putrifaction.
(n) :
The act of causing to rot; the anaerobic splitting of proteins by bacteria and fungi with the formation of malodorous, incompletely oxidized products.
(n) :
The act of causing to rot; the anaerobic splitting of proteins by bacteria and fungi with the formation of malodorous, incompletely oxidized products.