There are several synonyms for the term "booster unit" that can be used depending on the specific context and application. Some common synonyms include amplifier, booster pump, booster station, and signal booster. An amplifier is a device used to increase the strength of a signal or voltage, while a booster pump is used to increase the pressure of fluids. A booster station, on the other hand, is a facility that provides additional pressure and flow to a pipeline network. Finally, a signal booster is commonly used to increase the range and strength of wireless signals. These synonyms can be useful for engineers, technicians, and anyone working in related fields to communicate about equipment and systems that boost performance.