Eight-sided is a descriptive term that implies an object having eight sides. Synonyms for the word "eight-sided" can be utilized to describe various things such as shapes, figures, geometries, constructions, edifices, structures, and more. Some synonyms for the word "eight-sided" include octagonal, eight-cornered, octodecagonal, polyoctagonal, octogonal, and octaplex. Octagonal is widely used to describe shapes, figures, and structures that are eight-sided. Octodecagonal is more specific and is commonly used to describe a shape that has eighteen sides, while polyoctagonal is more general and is used for shapes beyond octagonal. Other synonyms like eight-cornered, octogonal, and octaplex are also occasionally used in specific contexts.