The expression "like a bull" implies strength, power and determination. There are other phrases and words that can be used to describe these traits such as "strong as an ox", "mighty", "assertive", "unyielding" and "tenacious". Each of these words evokes a different nuance of the bull-like characteristics. For example, "strong as an ox" emphasizes brute force, whilst "tenacious" suggests a fierce determination to succeed. Ultimately, the choice of synonym will depend on the context of the sentence and the desired tone. Whether it be in a sports commentary or a motivational speech, finding the right synonym can make all the difference in delivering a powerful message.