Rhombus.
Rectangles and squares all have angles measuring 90 degrees.
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A rectangle is not always equilateral, although it is always equiangular. A rhombus is not always equiangular, but is always equilateral. A square is both equilateral and equiangular.
A rhombus is NEVER equiangular. If it were equiangular it would no longer be a rhombus but a square.
A rhombus cannot be a square. A rectangle is an equiangular parallelogram. A rhombus is an equilateral parallelogram. A square is an equilateral and equiangular parallelogram. Thus, a square is both a rectangle and a rhombus.
You could call it a regular quadrilateral, or an equilateral rectangle or even an equiangular rhombus, if you prefer.
square or rhombus