"Most horsed" can be replaced with the word "equine-heavy" to refer to a setting or situation with a high concentration of horses. Alternatively, "horse-laden" can also be used to describe a place where horses are heavily present. Another option is "horse-dense" which implies an area where horses are clustered together in proximity. "Horse-rich" is another synonym for "most horsed", denoting a place where horses are abundant and plentiful. All of these alternatives provide a more descriptive and nuanced understanding of a place dominated by horses, highlighting their presence and impact.