Saprogenous is a word that refers to something that causes decay or decomposition. However, there are many other words that can be used in place of saprogenous. For instance, words like putrefactive, decompositional, rotting, decaying, or degrading can all convey the same idea. Further synonyms include fermenting, breaking down, spoiling, or corrupting. Each of these words can be used to describe the process by which organic matter decomposes into its constituent parts. Overall, the English language offers a plethora of synonyms for the word saprogenous that can add variety and nuance to written or spoken language.