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They are shapes.
Maybe only a circle and a oval. :P
They are both 2 dimensional curved shapes
Circle, triangle, oval, ellipse, & irregular shapes
There are several different "oval" shapes. A running track, which comprises two semicircles separated by two straight stretches is an oval. So is the cross section of an egg - a shape in which the cross-sectional width does not change uniformly. Another example is the ellipse. Because all these shapes are called ovals, there is no single name.