However, here are some ways to create related nouns using prefixes:
* Pre-agony: This would refer to the time or state *before* agony.
* Post-agony: This would refer to the time or state *after* agony.
* Anti-agony: This could be used to describe something that prevents agony or relieves it.
It's important to note that these are not standard terms, and their meaning would depend on the context in which they are used.
If you're looking for a more direct synonym for "agony," words like anguish, torment, pain, suffering, distress, misery might be more appropriate.