You'll likely need a
water pump pulley puller and possibly a
socket and wrench to remove the water pump from a 1995 Cadillac DeVille with a 4.6L engine. The pulley puller is specifically designed to remove the pulley from the water pump shaft, allowing you to then access and remove the pump itself with the appropriate size sockets and wrenches to loosen the mounting bolts.
It's important to note that the specific size and type of puller will depend on the vehicle's water pump design. You might need to consult a repair manual specific to your 1995 Cadillac DeVille 4.6L to identify the correct tools. A general auto parts store should be able to help you find the right puller once you've determined your needs.