Autocannon vs. Weapon — What's the Difference?

An autocannon, automatic cannon or machine cannon is a fully automatic gun that is capable of rapid-firing large-caliber (20 mm/0.79 in or more) armour-piercing, explosive or incendiary shells, as opposed to the smaller-caliber kinetic projectiles (bullets) fired by a machine gun. Autocannons have a longer effective range and greater terminal performance than machine guns, due to the use of larger/heavier munitions (most often in the range of 20–57 mm (0.79–2.24 in), but bigger calibers also exist), but are usually smaller than tank guns, howitzers, field guns or other artillery.

A weapon, arm or armament is any implement or device that can be used with the intent to inflict damage or harm. Weapons are used to increase the efficacy and efficiency of activities such as hunting, crime, law enforcement, self-defense, and warfare.

A fully automatic projectile weapon similar to a machine gun, but firing shells instead of bullets and larger in calibre.

An instrument of attack or defense in combat, as a gun, missile, or sword.

(Zoology) A part or organ, such as a claw or stinger, used by an animal in attack or defense.

A means used to defend against or defeat another

To supply with weapons or a weapon; arm.

An instrument of attack or defense in combat or hunting, e.g. most guns, missiles, or swords; arm.

An instrument or other means of harming or exerting control over another.

A tool of any kind.

An idiot, an oaf, a fool, a tool; a contemptible or incompetent person.

A very skilled, competent, or capable person or thing worthy of awe.

(transitive) To equip with a weapon; to arm.

An instrument of offensive of defensive combat; something to fight with; anything used, or designed to be used, in destroying, defeating, or injuring an enemy, as a gun, a sword, etc.

Fig.: The means or instrument with which one contends against another; as, argument was his only weapon.

A thorn, prickle, or sting with which many plants are furnished.

Any instrument or instrumentality used in fighting or hunting;

A means of persuading or arguing;