In a Composite (or Decorator) structure, Prototype uses a prototypical instance to create new Composite Component. Composite is a structural pattern where as Prototype is creational pattern. They are related to each other in a sense that Prototype only make sense in the context of a structural pattern like Composite or Decorator.
Command pattern is a behavioral pattern in GoF as it allows us to decouple between the Invoker (a.k.a. sender, an object that invokes an operation) and the Receiver (an object that receives the request to execute a certain operation).
Also known as an action or transaction pattern.