but you cannot deny that one is functionally designed to be good at a certain task that the other is not designed to be good at.
Designed to be good doesn't equal to actually being good. Plenty of things not designed to kill do kill more effectively than weapons.
No Xant if anything it's subjective to suggest a gun is anything but a gun.
Well that's exactly what we're telling you.
To me a gun is a gun because it is declared by the manufacturer as such. It is classified by laws and regulations as a gun.
An object is called a gun because that object corresponds to the definition of the word "gun". Manufacturers, laws and regulations may use other definitions of "gun", yet for communication to be effective we only need to declare one of them as accepted.
It will never be a book end or a toothbrush even if you use it like one.
Again, I agree but you seem to be contradicting yourself. What about the engineers who created a gun with the intent of making something you can brush your teeth with?
The fact that to someone else it might be something else is entirely subjective. But I'm seriously not going to argue about philosophical nonsense about what something is and isn't. It so far removed from practicality that it's a complete waste of time.
Semantics are important. If we accept multiple meanings for the same words, communication breaks and detecting fallacies becomes exceptionally difficult.
Society itself is built around the implicit threat of violence. If you can't see a gun as a tool with a very clear purpose in that situation, you're just not looking at a big enough picture.
Yet that's not what people arguing pro-guns will actually use as an argument. They will say guns are mostly used for self-defense (against humans and animals), hunting and recreation. The threat of violence merely refers to the guns used by the authorities, not that of the public. Seems completely irrelevant to me.
The main point is that because a gun is "designed to kill" doesn't make it an undesirable or useless thing by definition. First off, hunting guns aren't designed to kill humans although some of them can. Regardless, being designed to kill doesn't mean it cannot be used as self-defense or even merely deterrence. Conversely, some weapons and equipments such as sniper rifles and silencers are difficult to justify selling to the public, no matter how hostile their environment is.