The term 'PUB PROJECTILE' is a combination of two words, 'PUB' and 'PROJECTILE, ' which can be solved by the four-letter word 'DART.' A PUB is a type of bar or tavern, usually found in the United Kingdom, where people go to socialize and drink alcoholic beverages. A PROJECTILE is an object that is thrown, shot, or projected through the air. In this case, a DART is a type of PROJECTILE that is thrown at a target. Therefore, the term 'PUB PROJECTILE' refers to a DART, which is often used in pubs for recreational purposes.