It is sometimes called the base.
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Its a pentagonal prism.
A cube can be called a cube or a 3 dimensional shape.
A 3-dimensional rhombus is called a rhomboid. It is the crystaline shape of mica.
It depends on the shape. The top of a pyramid will be a point (the apex). The top (and bottom) of a prism or an antiprism will be congruent polygons.
It is a 3 dimensional shaped object