The phrase "b.horse" is often considered vulgar and inappropriate, but there are several synonyms that can be used in its place. Some commonly used alternatives include "stud," "gelding," "mare," "colt," and "filly." Each of these words describes a specific type of horse, but can also be used more generally to refer to any equine. Additionally, words like "thoroughbred," "Arabian," and "Appaloosa" describe specific horse breeds and can be used instead of "b.horse" to be more specific. It's important to remember that using offensive language can be hurtful to others, so choosing appropriate synonyms is always the best option.