The term "thuggees" refers to a notorious group of criminals who operated in India in the 19th century. However, there are several other words that can be used as synonyms for this term. For example, "bandit," "outlaw," and "robber" all refer to individuals who engage in illegal activities, such as stealing or attacking others. Additionally, "assassin" or "killer" could be used to describe someone who intentionally murders others. While the word "thuggees" specifically refers to a historical group, these synonyms are more general and can apply to criminals in any context.