there are many:
circle, square, rectangle, rhombus, diamond, star, triangle, oval, ellipse, polygon, ...
anything you can draw on a piece of paper without picking up your pencil or crossing any line you've already drawn and then connecting back to your starting point.
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the difference between a two dimensional shape and and a solid is that a two dimensional shape is plane and a solid you can see the whole shape a the inside.
An oval is two-dimensional. An ovoid is a three-dimensional shape based on an oval - like an egg,
It is a polyhedron.
If the shape is two-dimensional then it is a circle, if the shape is three-dimensional then it's a sphere.
a polyhedron * * * * * That is only if it is bounded by plane faces. A sphere, for example, is a three dimensional shape but is not a polyhedron: it is a solid shape.