There are several synonyms for the word "horse-hung" that can be used to describe a man's endowment. Some of these include "well-endowed," "well-hung," "gifted," "blessed," and "endowed." Each of these words conveys the same meaning as "horse-hung," which refers to a man who is exceptionally well-equipped in the genital region. While these terms may be considered vulgar or offensive to some, they are commonly used in casual conversation and in adult entertainment circles. It is important to remember to use these words with discretion and respect, as they can be hurtful or inappropriate when used inappropriately.