"ATL RC WEST" stands for Atlanta Regional Commission West, which is a regional planning agency in the United States. When it comes to searching for synonyms for this specific term, it becomes apparent that synonymous expressions might not perfectly encapsulate its meaning. However, we can explore alternative ways to refer to a regional planning agency or a city division. Some potential synonyms could include "west regional planning commission", "Atlanta RC West division" or "western sector of Atlanta Regional Commission". While these phrases may not have the exact same meaning, they convey the general idea of a regional entity focused on planning and development in the western part of Atlanta.