Cislunar refers to the region between the Earth and the Moon, and it is commonly used among astronomers, scientists, and engineers. However, there are several synonyms for the word cislunar, including sublunar, trans-lunar, and intralunar. Sublunar refers to a region below the Moon's orbit, while trans-lunar denotes a region beyond the Moon's orbit. Intralunar refers to a region within the Moon's orbit. Other synonyms for cislunar include interlunar, mesolunar, and terreslunar. These synonyms help convey the same idea of a specific region of space around the Moon and the Earth. Using these synonyms can make your writing more varied and precise.