General:
* Change
* Shift
* Move
* Transformation
* Evolution
* Metamorphosis
* Conversion
* Progression
More specific:
* For a change in state: Conversion, metamorphosis, alteration, mutation
* For a change in position: Movement, displacement, relocation
* For a change in time: Progression, development, evolution, advancement
* For a change in process: Shift, switch, alteration, modification
Figurative:
* For a change in emotion: Swing, fluctuation, shift
* For a change in theme: Shift, departure, turn, pivot
The best synonym depends on the specific context of the sentence.