Charlies is a word that is often used to refer to the enemy or opposition in various contexts. However, there are several synonyms for this word depending on the context. For instance, if used in sports, the opposite team can be referred to as opponents, rivals, or challengers. In business, competitors, contenders, or adversaries can be used instead of Charlies. In the military, the word enemy is a common synonym for Charlies, but there are also other terms such as hostiles, foes, or adversaries. Ultimately, the choice of synonym will depend on the context and the level of formality required.