* Change can be used as a noun to refer to the act of changing, the process of change, or the result of change. For example:
* "The store is undergoing a major change." (process)
* "There has been a change in the weather." (result)
* Alteration is a more formal word that refers to a change, especially a minor one, that is made to something. For example:
* "The dress needed a few alterations."
The best choice depends on the context and the specific meaning you want to convey.