no fencing weapon has 4 sided blades.
The largest and heaviest Fencing weapon is the Epee
The meaning of the word nuclear weapon, is a weapon that has a nuclear warhead on it.
Kill or capture the enemy with minimal collateral damage. Also destroy weapon and ammo storage facilities. And finally destroy command and control facilities.
I believe it was a fencing rapier.
The best fencing weapon would usually be the sword.
The weapon used for training in the fencing duel era was called the foil (fleur). It is still used as one of the 3 weapons for fencing today, although it has never historically been a real weapon used for combat. There isn't a training sword in fencing. Originally the foil (see above) before the sport fencing - like we know it now - exsisted. Now you choose a weapon (like the foil) and train with that. So in fencing there is no training sword.
This nuclear weapon is called an atomic bomb or a nuclear bomb
The US currently disposes of its nuclear weapons at the Pantex plant just outside Amarillo, TX, the same plant that assembles new ones and refurbishes/retrofits old ones. The process is roughly the reverse of assembly, with the conventional explosives being burned and the plutonium, uranium, and miscellaneous radioactive materials put in storage.
Nuclear weapon detonations
If by "bomb" you mean a conventional explosive weapon, then the nuclear weapon is more powerful.
A sabre is a weapon used by the American Revolution. It is also a weapon used in Fencing.