The term "planetal" is a specific scientific term used to describe something that pertains to planets. However, there are several synonyms that can be used to convey a similar meaning, such as planetary, celestial, astronomic, astronomical, cosmological, and astrophysical. These words can be used interchangeably when referring to the study of planets, their movements, and their characteristics. When writing about planets or referencing their properties, it is essential to use the appropriate terminology that is scientifically accurate and understandable to the intended audience. Therefore, it is useful to have a vast selection of synonyms available to provide a more varied and engaging vocabulary.