Cube
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The square based pyramid does not stack or roll.
cylinder
The noun 'stack' is a singular, common, concrete noun; a word for a thing.
Cube
Oh, what a delightful question! If you stack rectangles on top of each other, you'll create a wonderful 3D shape called a rectangular prism. Just imagine those rectangles piling up so neatly and forming a solid shape with six faces, where each face is a rectangle. Keep on creating, my friend!