Pentahedron is a geometric term used to describe a three-dimensional figure with five faces. The word is derived from the Greek word "penta" which means five and "hedron" which means a flat surface. There are several synonyms for the word pentahedron, including five-sided polyhedron, five-faced solid, and pentagonal-based pyramid. Other synonyms include pyramid with a pentagonal base, triangular dipyramid, and pentagonal pyramid. The pentahedron is a unique and fascinating shape that can be found in nature, art, and architecture. Understanding the synonyms for pentahedron can help individuals describe this shape more accurately and concisely.