A 'breakthrough role' is a term used to describe an actor's career-defining performance that propels them into stardom. Synonyms for 'breakthrough role' include 'breakout performance', 'shining moment', 'career-making role', 'milestone performance', 'star-making turn', 'life-changing role', and 'key role'. These terms emphasize the importance of a single performance in launching an actor's career. While some actors may reach fame and success through a gradual accumulation of notable performances, a 'breakthrough role' typically refers to a single, defining moment that sets an actor on a path to success. Regardless of the words used, a 'breakthrough role' is an undeniable catalyst for an actor's career.