Dipyramid is a word that is often used in mathematics to describe a shape that resembles two pyramids connected at their bases. There are a few synonyms that can be used to describe this shape, including bipyramid, which is a more commonly used term in geometry. Another possible synonym is double pyramid, which is a more descriptive term that emphasizes the fact that the shape consists of two pyramid-like structures. Other possible synonyms include twin pyramid, or biangular pyramid, which both emphasize the shape's angular features. Regardless of the synonym used, all of these terms refer to the same unique and complex geometric shape.