nonagon(also called an enneagon)
You can name the sides any way you like.
Hexagons
nonacontagon
113
pentagon
polologous
It means many sides
Shapes with straight sides are called polygons
Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.
a quadrilateral, or Tetragon, or Quadrangle
Regular polygons.
There are infinitely many polygons so it would be impossible to name them all. For the names of those with a fewer sides see the related link.