Rocketship is a term used to describe a spacecraft that is propelled by rocket engines. However, there are several other words that can be used interchangeably with rocketship. For instance, the term spacecraft refers to any type of vehicle that can travel in space. Another synonym for rocketship is spaceship, which is another term for space vehicle. A spacecraft that is designed to carry astronauts into space is often called a space shuttle. Other synonyms include space rocket and rocket, both of which refer to a vehicle that is propelled by rocket engines. Ultimately, there are several words that can be used as synonyms for rocketship, depending on the context in which it is being used.