When is a nova not a nova? When a white dwarf and a brown dwarf collide

When is a nova not a nova? When a white dwarf and a brown dwarf collide 2

Astronomers have found for the first time that a white dwarf and a brown dwarf collided in a ‘blaze of glory’ that was witnessed on Earth in 1670. https://www.sciencedaily.com/releases/2018/10/181008083504.htm