There are several synonyms for the word "actress Tilly." Firstly, Tilly can be replaced with her full name, which is often used in formal settings. Additionally, the term "female performer" or "female artist" can be used universally to refer to any woman working in the entertainment industry. Another synonym is "leading lady," which denotes the foremost female role in a production. Similarly, "starlet" or "diva" can indicate a glamorous and elite actress. "Performer" is another useful synonym, as it encompasses actors, singers, dancers, and other entertainers. Finally, "thespian" is a more formal term for an actor or actress, suitable for academic or artistic contexts.