Time-keeper is a word used to describe someone who keeps track of time or maintains a schedule. There are several synonyms for this word that can be used interchangeably in different contexts. One such synonym is "chronicler," which refers to someone who records events in chronological order. Another synonym for time-keeper is "time-management specialist," which implies a certain level of expertise in managing schedules and timelines. "Punctualist" is another synonym that emphasizes the importance of punctuality and adherence to schedules. Other synonyms include "scheduling coordinator," "time planner," and "time monitor." Regardless of the synonym used, all imply a certain level of responsibility when it comes to maintaining schedules and keeping track of time.