The term "steel derby" might not be one that is widely known or used, but there are a number of related synonyms that could be used to describe a similar type of event or competition. One option might be a "roller derby," which involves teams of skaters competing in a physical and athletic contest on a circular track. Another potential synonym could be a "soapbox derby," in which participants race homemade cars down a hill or incline, often constructed from wood or other materials. Other possible synonyms include "go-kart racing," "bumper car derby," or "motocross racing." Regardless of the specific terminology used, these events are typically designed to showcase speed, skill, and competitive spirit among participants.