The term 'PROPELLED A BOAT' can be solved by two five-letter words: 'ROWED' and 'OARED'. Rowing is a form of propulsion that uses oars to move a boat through the water. It is one of the oldest methods of propelling a boat, and is still used today in many recreational and competitive sports. Oaring is similar to rowing, but instead of using two oars, one oar is used to propel the boat forward. Both rowing and oaring require strength and skill, and are popular activities for those looking to explore the outdoors.