An expander is a device or tool that is used to expand or enlarge something. It can also refer to a process or strategy that is used to increase or amplify the effectiveness of something. There are several synonyms for the word "expander" that can be used in various contexts. These include magnifier, stretcher, amplifier, enhancer, booster, extender, widener, dilator, and enlarger. Depending on the context, each of these words can be used interchangeably with the word "expander" to provide a more descriptive and varied description of the intended meaning. By using synonyms, writers and speakers can also add nuance and variety to their language.