In astronomy terms the difference between supernova and superbubble

is that supernova is a star which explodes, increasing its brightness to typically a billion times that of our sun, though attenuated by the great distance from our sun. Some leave only debris (Type I); others fade to invisibility as neutron stars (Type II) while superbubble is a very large region of space, relatively free of matter, created by multiple supernova explosions.