A Base.
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What? Every prism, by definition, has two congruent faces which may be called the bases of the prism.
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A polyhedron that has 2 congruent faces is a PRISM. To be a prism, all the other sides (not including the 2 that are congruent) have to be 4-sided.
A rectangular prism has 3 pairs of congruent faces
pentagonal prism
yes there are congruent because of the shape * * * * * Wrong. The faces may me congruent but don't have to be. Think of a brick (a rectangular prism). Its top and side are certainly not congruent. And there is no requirement, in such a prism, for the top and bottom to be congruent either.
It is a triangle.