A five sided 3d shape is called a pentehedron
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'Pentahedron',
However, do not confuse withe 'pyramid' , which is also a 5=sided 3-dimentional object, with a square base and four triangular sides.
a 4 sided 3d shape is called a triangular prism!!!!!!!!!!!!!!!
icosahedron
Heptrahedron
Triangular Pyramid.
Oh, dude, you're looking for a pentagon. It's like a shape with five sides in 2D, but when you add some depth to it, it becomes a pentagonal prism. So, yeah, pentagon is the name you're after.