A triangular prism is a polyhedron.
Polyhedra is a plural term.
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They are both polyhedra with five faces.
They are polyhedra, with several rectangular faces, and with two identical and parallel bases.
They are both polyhedra. They both have faces that have 3 or 4 edges, and not any other.
A hexagonal prism is a polyhedron. Many hexagonal prisms are polyhedra.
A side is the same thing as a face. A quadrilateral based pyramid or triangular prism are the two possible polyhedra.