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Hexagon

The word that does not belong to the group is Hexagon.

A hexagon is a six-sided polygon, while square, parallelogram, and rhombus are all four-sided polygons.

A hexagon has 6 sides, 6 vertices, and 12 diagonals.

A square has 4 sides of equal length and 4 right angles.

A parallelogram has 2 pairs of parallel sides and opposite sides are equal in length.

A rhombus has 4 sides of equal length and opposite angles are equal.