Warehouse management is performed on different levels. While a warehouse management system (WMS) is the brain of the warehouse, continuously steering the movement and storage of goods, the warehouse control system (WCS) manage how tasks are performed, e.g. by cranes, picking stations and other types of automation equipment. In other words, a bit like a police officer directing the traffic in a busy intersection.
If your warehouse uses mostly manual processes and your automation is non-complex, a WMS system might be enough. But the more different types of automation from different vendors and the more complex the solution, the more you will need a WCS.