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A supernova is the phenomenon which occurs when a star dies out. When a star dies, it gives out immense amount of energy in form of rays, generally know as gamma ray and their bursting is called gamma ray burst. When a star takes birth, it has some mass, and from Einsteins equation we know that mass is converted into energy, hence the life period... the star uses its mass. But the star also has its standard units of energy below which it cant exists, now when the mass of stars decreases and so the energy, it starts to accelerate the process of energy formation....., due to which their is uncontrollable reactions of fission and fusion in the helium atoms present in the star, due to this a explosion takes place... this explosion is called as supernova.For a start to go Super nova , it has to have minimum mass of about 8 times the mass of the Sun.

A Hypernova is process which starts after the occurring of the supernova. When the limit of the supernova exceeds and it starts releasing great amount of gamma rays, it marks the onset of the hypernova..... or we can say that the hypernova are the second stage of supernova.Basically For a start to go Hypernova ,it should be atleast 30 times the mass o the sun
This Hypernova marks the event where stars collapses to a form a black hole emitting energy Jets

Hypernovas are said to be the source of High energy Gamma Rays and are also called Collapsar.

Hypernova is also the explosion whose energy can only be compared to Big bang

well there are some quasars and black hole mergers which can surpass hypernova's energy. The efficiency of black hole driven mechanism is generally more than any stellar activity ... Ofcourse mass of the black hole is a concern not every black hole can power more energetic events than hypernova... But there are quasars and supermassive black hole mergers that give out mammoth quantity of energy be it in EM or gravitational wave form...