Sir Barton was a legendary racehorse, who won the Triple Crown in 1919. As one of the most famous horses in American Thoroughbred racing history, he has become the subject of various synonyms and nicknames. Some of the synonyms used to refer to Sir Barton include "The King", "The Champion", "The Ace", and "The Great one". Because of his speed and athleticism, Sir Barton was known as "The Bullet" and "The Speed King". Considering his dominance on the track, he was also called "The Unbeatable" and "The Invincible". These synonyms are a testament to Sir Barton's unmatched skills and prowess in the world of horse racing.