i think it's a cone
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No, it cannot be a cone. But there are a number of possibilities:
A decagonal pyramid = a pyramid whose base is a decagon.
A nonagonal prism = a prism whose bases are nonagons.
A pentagonal pyramid + pentagonal frustum = two pentagonal pyramids stuck together along their pentagonal bases and with one of the apices (plural of apex) cut off.
A cuboid with three corners cut off.
et cetera.
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were two or more faces of a solid figure
Polygonal faces.
A square is not a solid figure at all. It's a flat figure, with four congruent faces and four congruent angles.
cone
a cylinder