A test rocket is commonly used to test rockets before they can be launched into space. However, there are many alternative words one could use when referring to a test rocket. Some synonyms for test rocket include a prototype rocket, experimental rocket, research rocket, and trial rocket. These words all suggest that the rocket is in the testing phase and has not yet been fully developed or launched into space. Furthermore, using these words can help to avoid repetition in writing or conversation when referring to rockets being tested for space travel. No matter the word choice, testing rockets is necessary to ensure a successful and safe journey into space.