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A pentagonal prism
A rectangular prism.
A hexahedron, or cube.
a rectangular prism
The solid is a cuboid, or "right rectangular prism" in which all angles are right angles. It is a box shape, or regular hexahedron.
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.
pentagonal prism
Any solid object with six faces is a hexahedron. A regular hexahedron (with 12 edges) is a cube where all the faces are squares An irregular hexahedron (with 12 edges) is a cuboid where two faces are equal squares and four are equal rectangles.
A square is not a solid figure at all. It's a flat figure, with four congruent faces and four congruent angles.
A cube is a solid figure called a polyhedron. A polyhedron is a solid figure with all flat faces. So a cone would be a solid figure but not a polyhedron becasue it has a curve and does not have all flat faces.
A solid figure with eight vertices and all faces of equal size is called a cube. Each face of a cube is a square, and a cube has 8 vertices and 6 faces.