The term "corser" is a bit outdated and not commonly used in modern language. However, there are several synonyms for this word that can be used as alternatives. Some of these include "horseman," "jockey," "equestrian," and "rider." Additionally, other terms that can be used in a similar context include "equestrienne," "equine expert," "horse trainer," and "stable hand." Each of these terms conveys a slightly different meaning or connotation, but all relate to the world of horses and horseback riding. Depending on the context and tone of the writing, one or more of these synonyms could be employed as a replacement for "corser".