The term 'Municipal Boss' can be defined as a mayor, which is a five-letter word. A mayor is an elected official who is the leader of a city or town and is responsible for representing the citizens in local government. The mayor is typically responsible for setting policy, managing resources, and overseeing the day-to-day operations of the municipality. Additionally, the mayor is often the public face of the city or town and is expected to represent the community in a positive light.