A shape with 5 sides is a pentagon
A hexagon
Hexagon shaped pyramid
A hexagon.
That would be - a Hexagon.
Hexagon
A cube. A 3-D shape with 6 sides which are all squares.
It has 8 sides.
Most star shaped items are referred to as a "polygon" The prefix poly- meaning "many" and the affix -gon meaning "sides" meaning many or multiple sides. In all reality, it's known as either a polygon or a 10-gon.
SIX sides
A 6-pointed star shaped snow crystal is commonly referred to as a dendrite snowflake.
It can have as many sides as it wants, up to the infinite. A regular shaped polygon with 4 equal sides is asquare; 6 is hexagon; 8 is an octagon, and so forth. An infinite number of equal sides would make a circle.