What do you classify as a weapon?

What do you classify as a weapon?
At risk of tainting someone’s idea what a weapon is, I will provide the details. A conversation broke out about weapons with a couple of friends, they are ex-military. I have been through the marine reserves but I don’t see weapons as they see weapons, theirs being closer to the talking points of the military. They think a deer rifle, or similar hunting rifle; single shot, semi auto or bolt action with 5 rounds or less is a weapon same as a FN FAR semi auto that can be converted to full and spit out close to 700 rounds a minute with a 20 to 40 round clip. They believe that since all rifles or sidearm were made off some military issue and that they are made to kill, that any firearm that fires a projectile is a weapon because it is designed to kill, animal, humans, notwithstanding. I say a Bushmaster, 30.06, or other rifles manufactured for hunting is not a weapon, it can be weaponized if used to shoot humans instead of deer. I believe it is a weapon if its created purpose was to take human life, be it a bladed knife, firearm, or anything else.