BSA is an acronym that stands for various meanings depending on the context. For instance, BSA can refer to the Boy Scouts of America, a youth organization in the United States that promotes character, citizenship, and personal fitness. BSA is also used in science to mean "body surface area," which measures the total surface area of the body. Other synonyms for BSA could include surface area, skin area, or bodily area. In addition, BSA is sometimes used in the business world to mean "business service agreements." Alternatives for BSA in this context could include service level agreements, contracts, or business arrangements. It's important to understand the context of the use of BSA to choose the best synonym.