hemisphere
A cylinder has 2 equal parallel flat surface circular bases and a curved surface body.
Just one at the base, the rest is a curved surface
A cylinder perhaps
The word "base" is just fine for this purpose.
Yes, a cylinder has both curved and flat surface. Considering a solid cylinder standing on its end, the circular base and the circular top are flat surfaces. The surface connecting the top and bottom is curved.
A cone.
hemisphere
A cone.
a giant or small cone
It has a flat base, a curved surface area, a circular edge and one vertex.
The description given fits that of a cone.
"you" is not a number and so the question does not make sense.
A cylinder has 2 equal parallel flat surface circular bases and a curved surface body.
An hemisphere is half of a globe with a circular flat base, a round edge, a curved surface but no vertices.
Just one at the base, the rest is a curved surface
A cylinder perhaps