* Conversion: This is the most common and general abstract noun for "convert." It refers to the act or process of converting.
* Transformation: This noun implies a more significant change or alteration, suggesting a complete shift in form, nature, or state.
* Change: A broader term that encompasses any alteration or modification, including conversion.
* Shift: Similar to change, but often suggests a movement or transition from one state to another.
The best choice will depend on the specific context and the type of conversion you are referring to.