Power economizer is a term used to describe a device or system that reduces energy consumption and helps save money on utility bills. However, there are other synonyms that can be used to describe this concept. Energy saver, power saver, and energy-efficient are a few words that convey the same meaning as a power economizer. Additionally, words like energy conservation, energy management, and energy efficiency can also be used in place of power economizer. Ultimately, these synonyms all aim to encourage individuals and organizations to reduce their energy consumption and be mindful of their impact on the environment.