A cylinder is one possibility, there are others.
If you have one flat face and I have one curved face, which one of us is the 3d shape? Anyway, a 3d shape with pne f;at, circular face and one curved face could be: a section of a sphere or a section of an ellipsoid cut by a plane parallel to one of its axes, a section of a paraboloid or a cone. There are probably other shapes.
It is a round 3d shape and it also has only one face. It is the shape of the earth
There is not a name becasue there are many different shapes. A sphere, an ellipsoid, a torus (doughnut), toroidal shapes with two or more "holes", a paraboloid, semi-hyperboloid etc are all 3-dimensional shapes which have got just one curved surface.
A "hemisphere" - a ball that's been cut into 2 equal parts. i.e "half a sphere".
A sphere has just one curved face.
All shapes have sides. Including a circle which has one curved side.
Get a ball. Draw any closed shape on it. The part inside the curve that you drew is one curved face and that is contained by the surface of the ball which is the other curved face.
A hemisphere
2. One at the top and one at the bottom. The face that is cylindrical cannot be counted as a base because it is curved - in 3D shapes the base must be flat.
a cone
a cone