Literally they both mean ball (orb from Latin, sphere from Greek).
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A hemisphere is half a sphere
Sphere is whole a hemisphere is not
They are very different, as a square sphere is impossible. The difference is that a square pyramid exists, whereas there's no such thing as a square sphere.
A sphere is round - like a tennis ball. A torus is ring-shaped - like a donut !
a sphere is a 3D circle like a ball 3D Items you can pick up they have three dimentions (they stand out) a circle is a 2D item like a pattern of circles 2D items have 2 dimentions (they're flat)