It's quite acceptable to call it a 207-agon but what's more important is knowing how to work out its properties.
The shape has 50 sides is Pentacontagon
A shape with six sides is a hexagon.
Tetradecagon is the correct name for a shape with 14 sides. :D
A shape with three sides is called a triangle.
There is no specific name for such a shape.
The name of the shape is a quadrilateral.
Any shape that has 4 sides is a quadrilateral
An hexagon is the name of a shape that has 6 sides.
A shape with five sides is pentagonal.
A 2D shape with 9 sides is called a Nonagon.
A pentagon has five sides.