The word "recharger" is often used to describe the act of replenishing energy in a device or tool. However, there are several other words that can be used as synonyms for this term. One such word is "replenisher," which carries a similar meaning of restoring or refilling something. Another option is "rejuvenator," which suggests the act of reviving and restoring energy. "Refueler" is also a potential synonym, particularly when referring to vehicles or machinery that require fuel. Other words that may be used in some contexts include "charger," "re-energizer," and "regenerator." Ultimately, the choice of synonym will depend on the exact context and tone of the sentence.