When it comes to finding synonyms for the word "exogenetic," there are a few options to consider. Firstly, the term "exogenous" is a common alternative, meaning originating externally. Additionally, "allochthonous" can be used as a synonym, which refers to a rock or sediment that was formed elsewhere and then brought to its current location. Another possibility is "heterogenous," which indicates something composed of diverse elements. It's important to note that each of these synonyms can have slightly different meanings and connotations, so it's important to choose the most appropriate term based on the context in which it will be used.