Pentagon. A 5 sided figure with one pair of parallel sides and two right angles.
The question doesn't give enough information. Is it a polygon? If so, how many sides does it have? It could be 4 or any larger number. A 4-sided polygon with one pair of parallel sides is called a trapezoid (if you're American) or a trapezium (if you're British). (I don't know about other dialects of English.)
It sounds like the shape that you are talking about is a right trapezoid. It only has one pair of parallel sides but its two left angles are 90 degrees.
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The shape you are looking for is a quadrilateral. If you have a square, all angles MUST be right angles. A parallelogram can also have 4 equal sides in length and parallel sides, but a parallelogram doesn't have right angles.
Rhombus
Rectangle
trapizoid
rhombus