A drop hammer is a type of hammer that falls under the gravity to apply force on the object. However, there are several other words that can be used instead of drop hammer. For instance, a power hammer, forging hammer, or trip hammer are all synonyms of a drop hammer. These types of hammers are widely used in the manufacturing industry to flatten and shape metal into various shapes and sizes. Similarly, a sledgehammer or maul can also be used to drop and apply force on an object. In addition, a pneumatically powered hammer is also a similar tool with the same function as a drop hammer.