Denner is a word that refers to someone who looks after a group of people, usually in a military context. This person could also be called a leader or captain. Other synonyms for denner may include squad leader, platoon leader, or even commander. Depending on the context, the person holding this position may also be referred to as a drill sergeant, recruit instructor, or sergeant major. Regardless of the term used, the denner is responsible for directing and guiding the group towards success, whether that means completing a mission or achieving a common goal. The importance of a strong leader cannot be overstated in any situation, and synonyms for denner help to reinforce that concept.