A prism, curved and tapered to a point at each end.
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If it's a flat figure (2 dimensional), it's a heptagon.If it's a solid object (3 dimensional), it's a heptahedron.Hepta is the Greek for seven
The solid commonly called a dodecahedron is not a solid pyramid but the name simply means a solid shape with 12 faces and so, a pyramid on a 11-sided polygonal base will be a dodecahedron.
A 5-sided 2-dimensional figure is a pentagon and a 5-sided 3-dimensional shape is a pentahedron.
A hexahedron is a solid with six plane faces, and a cuboid is a six-sided figure each face of which is a rectangle.
A hexagon is a 6-sided plane shape (polygon). A hexahedron is a 6 -sided solid shape.