the Square and the Parallelogram
If there can be more sides then an y of the regular polygons with an even number of sides fill the bill: regular hexagon, octagon, decagon...
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Since you described it as 2 sets of parallel sides, I'll assume you meant a 4 sided polygon(quadrilateral). This special case is called a rhombus.
parallelogram
General term for a polygon with 4 sides is a quadrilateral. A parallelogram is the special case with two pairs of parallel sides.
You can construct any polygon with more than 4 sides such that two sides are parallel. A quadrilateral in which two lines are parallel is called a trapezoid.
A quadrilateral is a polygon with four 'sides' . A parallelogram is a quadrilateral with two sets of parallel sides.