Small arm is a term used to describe a firearm that is designed for individual use. It is typically a handheld weapon, such as a pistol or rifle, and is usually smaller than a standard military weapon. The term 'INLET' is a five-letter word that can be used to describe a small opening or entrance, such as a bay or harbor. In this context, it could refer to the barrel of a small arm, which is the entrance through which the bullet is fired.