A nonagonal prism is a geometric polyhedron whose top and bottom are nonagons (polygons with nine sides) connected to each other by nine rectangles.
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Nonagon
An hexagonal prism would fit the given description
A decagon based pyramid. It is a hendecahedron but that can take many shapes. A nonagon based prism, for example.
A decahedron. Some decahedron shapes are a nonagon-based pyramid, an octagon based prism, or a pentagon based di-pyramid.