Caliver is an old term used to describe a type of firearm commonly used in the 16th and 17th centuries. It is also known as a "calibre" or a "caliber." Some synonyms for caliver include arquebus, musket, and rifle. The term arquebus is a French word that also refers to a type of firearm used in the 15th and 16th centuries. A musket is a type of shoulder firearm that was commonly used by soldiers in the 18th and 19th centuries, while a rifle is a long, gun designed to be fired accurately at long ranges. While these terms are similar, they each refer to distinct types of firearms with different designs and intended uses.