Scabbards vs. Sheaths
For the first entry, I will have the difference between the scabbard and the sheath. I see many people mistake the two for each other.
Scabbards are for swords, long daggers, or other weapons with long blades. They are rigid, made of metal or wood, and usually protect whatever fits in it very nicely. Sometimes scabbards are even used for rifles and bayonets. Notice all of these are designed for killing people. Basically, scabbards were made for an easy place to put a sword that protects in while also making it accessible, with the scabbard attached to the belt or (Quite stupidly) on the back. They have to be rigid so they don’t bend and damage the sword or expose the sword to potentially hurt the user.
On the other hand, sheaths are used for knives, axes, and even brush hooks. They are usually flexible (Often leather) and easy to handle/slot the weapon in. But that’s the twist. Sure, knives and axes are excellent instruments of war, but that is not their only use. Axes cut trees, knives cut food. They aren’t only weapons, they are more commonly modern tools. That is why they only need sheaths. You need not worry about the knife flying out of your sheath in war because you aren’t in war, and if you actually are in war, you won’t be running around with a knife, you’d use a gun.
So there you have it. Scabbards are for longer swords and weapons, they are rigid and strong. Sheaths are for shorter knives and tools, flexible and very easy to use and make.
Top/left: Scabbard
Bottom/right: Sheath