a heptigon
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An eighteen-sided shape is called an octakaidecagon, or octadecagon.
Only if 2 sides are parallel with each other, and the other two sides are also parallel with each other. All squares are rectangles. All rectangles are parallelograms. All parallelograms are 4 sided. But not all 4-sided are parallelograms, not all parallelograms are rectangles, and not all rectangles are squares.
The names of polygons with 40 sides - Tetracontagon.
A polygon is an unequal six sided shape. A polygon or hexagon is the name used weather the sides are even or not.
10 sided shapes are known as decagons.