In hieroglyphs the topmost pinnacle stone of a pyramid is called bnbnt, written benbenet or benben by Egyptologists. This word also signifies a sacred stone and is closely related to the word for the stem of a ship.
The Greeks who visited Egypt in ancient times gave the name pyramidion to this type of cap-stone.
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It is the apex.
yes
tat the pentagonal pyramid has a point at the top and the pentagonal prism is flat with out a point.
A four sided pyramid is called a square based pyramid. It has a square base and four sides,(called edges,) that join at the apex. (the top of the pyramid.)
they both have a point at the top and is both three demensional shapes with polygons on the sides