Rhombus
http://www.mathwarehouse.com/geometry/quadrilaterals/parallelograms/images/rhombus/rhombus-diagram.jpg
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A polygon with 4 right angles is a rectangle. (A square is a "regular" rectangle.)
A square and rectangle.
a square
I think it is "quadrangle". If it has 4 equal sides and 4 right angles, "square" is right.
Rectangle or a square.