There are several synonyms that can be used to describe a mechanical system. One common term is "mechanism," which refers to the parts that work together to create motion or perform a specific function. Another synonym is "apparatus," which emphasizes the equipment or machinery involved in the system. "Machine" is also a common synonym for a mechanical system, particularly those that are complex or have multiple moving parts. Other options include "engineering system," "mechanical setup," and "equipment configuration." Overall, these synonyms all convey the idea of a mechanical system that involves interrelated parts working together to achieve a specific outcome.