What term is reserved for the most energetic class of supernovae capable of surpassing the brightness of their host galaxy?

Answer

Superluminous supernovae (SLSN) or hypernovae

The class of explosions exhibiting brightness exceeding the host galaxy's combined light are specifically termed Superluminous Supernovae (SLSN) or hypernovae.

What term is reserved for the most energetic class of supernovae capable of surpassing the brightness of their host galaxy?
galaxyastronomystarssupernovabrightness