Strictly speaking, any 3d figure with anything besides 6 sides cannot consist of rectangles. However, the name for an 8-sided figure is "octahedron".
A cuboid.
A cube
Cuboid
A cuboid has 6 faces that are rectangles.
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cuboid
A rectangular prism.
Not any geometric figure.
A hexahedron, or cube.
A tetrahedron.
Strictly speaking, any 3d figure with anything besides 6 sides cannot consist of rectangles. However, the name for an 8-sided figure is "octahedron".
A cuboid.
A cube
A rectangular cuboid would fit the given description
A rectangular prism is a hexahedron with some rectangular sides. There is no requirement that all sides be rectangles. If they are, the solid is a right rectangular prism, or cuboid.
A cube has six square faces. A cuboid also has six faces but 4 or 6 or them may be rectangles.