When it comes to finding synonyms for the word "rivals," there are a plethora of options to choose from. Some of the most commonly used synonyms include competitors, adversaries, challengers, opponents, foes, antagonists, and contenders. Each of these words connotes a sense of competition or opposition, with some carrying a slightly more aggressive or confrontational tone than others. Depending on the specific context in which you're using the word, certain synonyms may be more appropriate or effective than others. Regardless of your choice, all of these words can help convey the idea of two or more entities vying for the same prize or goal.