Would the N3 class be called super-dreadnoughts if it had been built?
Short answerPossibly not; the class might instead be called a new Dreadnought and reset the public label for the next generation.
NotesPublic terminology would be unlikely to keep adding superlatives to the existing dreadnought label. A completed N3 represented enough of a new scale and arrangement to invite a fresh name. The Royal Navy might call the class Dreadnought and let it establish another generational benchmark. Newspaper language tends to settle on the shortest and most memorable description rather than the most technical one.