Ball-peen hammers are tools that are used to shape and manipulate metal. However, when it comes to finding synonyms for the term "ball-peen," there aren't many options available. Some common alternatives include "peen hammer," "cross-peen hammer," and "machinist's hammer." These names all refer to similar tools that are used for a similar purpose. However, ball-peen hammers are often favored over other types because of their unique shape, which makes them highly versatile and easy to use. Whether you're working in construction, metalworking, or any other industry that involves working with metal, a ball-peen hammer is an essential tool that you won't want to be without.