The term "Roman Legion" is widely used to describe the military forces of ancient Rome. However, there are a few synonyms that can be used to refer to this term. For example, the term "Roman Army" is commonly used interchangeably with "Roman Legion." Additionally, "Roman soldiers" or "Roman troops" can be used to describe the individual soldiers who made up the legion. In some cases, the term "Roman Cohort" can also be used, although this typically refers to a smaller division within the legion. Overall, there are several synonyms that can be used to describe the powerful military forces of ancient Rome, each with their own unique connotations and nuances.