The word "prelims" is a short form of preliminary examination or preliminary round, which is used to refer to an initial test or contest that precedes the main event. Antonyms for this term include final, concluding, main, and ultimate. The word "finals" is used to describe the last and most important round or examination, while "concluding" represents the end of a series or event. The term "main" is used to describe the most significant, crucial, or important element, while "ultimate" refers to the last or final stage or peak of a process. These antonyms help express the opposite concept of prelims, which are the initial steps before the main event or outcome.