Rocket fuel is a powerful substance that powers spacecraft into space. However, there are many different terms that refer to the same thing. One synonym for rocket fuel is propellant, which is any material used to create thrust. Another synonym is booster, which refers to a type of rocket designed to provide additional power to a spacecraft. Other terms for rocket fuel include igniter, accelerant, and reactive mass. These terms are often used in the aerospace industry and in science fiction novels and movies. Whether you call it rocket fuel, propellant, or something else entirely, there is no denying the awesome power it possesses.