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A pentagon (5-sides), hexagon (6-sides), heptagon (7-sides), and octagon (8-sides) are all examples of shapes with more than four straight sides.
Shapes with straight sides are called polygons
Any shape with four straight sides is a quadrilateral. A trapezoid has one pair of parallel sides, and a parallelogram has two pairs of parallel sides. So any shape with four straight sides and no parallel sides is a quadrilateral that is not a parallelogram or trapezoid.
They are plane (2 dimensional or flat) figures. They are closed shapes. They are bounded by four straight sides. Then there are others that follow from the general attributes of polygons.
A Square