The word "module" comes to mind. A class in Java can be viewed as a software module, of which more than one instance can be created. Sometimes, this is even the

The word "module" comes to mind. A class in Java can be viewed as a software module, of which more than one instance can be created. Sometimes, this is even the best way to view the class. Other times, it's better to view it as a class representing some noun. A thing like a "comparator" or an "XYZ factory" is not a domain noun, but rather a pluggable code module.