On most aircraft, the speed brakes, ground spoilers, and spoilers share the same set of panels.
Ground spoilers are the full set, raised all the way. They immediately dump most of the wing's lift, sit the aircraft down firmly in the wheels, and allow the brakes to work at their best.
Speed brakes are a subset of the spoilers. They don't raise all the way, and work symmetrically. They are used to kill energy..be it speed or altitude.
Spoilers are another subset, and are used asymmetrically for roll control.
