It could be a square, rectangle or a parellelogram.
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Well If you are looking for a four sided shape with no parallel sides it is called a trapezium.
The four sided shape that has two parallel lines is called a trapezoid. A parallelogram is a four sided shape that has two pairs of parallel lines.
A rectangle is a shape that has four sides with two parallel lines.
Parallelogram
If two sides are parallel and the other two aren't, the shape is a trapezoid.