A plane figure with four sides and four angles is called a Quadrilateral. Quad means four. An Example for a Quadrilateral are: rectangle, square, rhombus, trapezoid, parallelogram, dimond.
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It is a quadrilateral
A rectangle is a plane figure with four straight sides and four right angles. Generally considered to have unequal adjacent sides to differ them from squares.
A quadrilateral is a closed plane figure with four straight sides.
A four sided figure with four equal sides and no right angles is a diamond, or a rhombus. If it had four right angles, it would be a square.
That's a rhombus. With an additional constraint on the angles, it's also a square.