Nonspherical refers to any object that is not spherical or round in shape. Hence, the antonyms for nonspherical would be those words that signify the shape of the object as round, circular, or spherical. For instance, words like spherical, round, globular, ball-shaped, and orbicular are some of the antonyms of nonspherical. Other antonyms could be words like circular, cylindrical, disk-shaped, and ring-shaped. Some examples of objects that are spherical in shape include a ball, a globe, a sphere, or a planet. In contrast, an object that is nonspherical could be an irregular rock, a cubical box, or a triangular prism.