Frontrunner is a term used to describe someone who is leading a race or competition. There are many synonyms that could be used instead of frontrunner. For instance, a leader is someone who is at the forefront of a competition. A front-runner can also be described as a winner or successful competitor. A top performer is someone who excels in their field and can be considered a frontrunner in a competition. Another synonym for a frontrunner is a champion, which means someone who has succeeded in a competition or achieved a major accomplishment. In summary, there are many synonyms that can be used to describe a frontrunner including leader, winner, top performer, and champion.