"Soum" is a relatively uncommon word that is often used to describe a Mongolian administrative unit. However, there are several synonyms that can be used instead of soum, including sum, somon, sumu, and somu. These words are also used to describe similar administrative units in different parts of the world, such as rural municipalities or districts. Each word may have slightly different connotations depending on the culture and region it is used in, but they all essentially refer to a small administrative area that is typically rural or sparsely populated. In general, these synonyms can be useful for writers and researchers who are looking for alternative terminology to describe these types of administrative divisions.