There are several synonyms for the term "baseball manager" that are commonly used by fans and commentators alike. One of the most common terms is "skipper," which is a slang term that originated in the early 20th century. Another popular synonym is "coach," which denotes someone who is responsible for training and developing the team's players. Other synonyms include "field boss," "team leader," "field manager," and "bench boss." Each of these terms carries slightly different connotations, but they are all generally used to refer to the person who is responsible for running the team on a day-to-day basis and making strategic decisions during games.