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Definition of hexagon:
Synonyms:

geometric figure (part of speech: noun)
 dodecahedron,
 pentagon,
 parallelogram,
 polygon,
 octahedron,
 scalene triangle,
 isosceles triangle,
 polyhedron,
 pentahedron,
 rectangle,
 tetragon,
 hexahedron,
 trapezoid,
 rightangle triangle,
 cube,
 quadrilateral,
 equilateral triangle,
 triangle,
 rhombus,
 heptagon,
 dodecagon,
 cusp,
 square,
 tetragram,
 quadrangle,
 tetrahedron,
 octagon,
 decagon,
 parallelepiped
Usage examples:

It is crowned by a railing and, at the corners where the transition to the hexagon occurs, by stone pyramids.
 "Cathedrals of Spain", John A. (John Allyne) Gade. 
We may start with a square, for example, but this is not so good as the hexagon because its side is incommensurable with the radius, and its perimeter is not as near the circumference.
 "The Teaching of Geometry", David Eugene Smith. 
That the side of a regular inscribed hexagon equals the radius must have been recognized very early.
 "The Teaching of Geometry", David Eugene Smith.