There are several synonyms for the word "time period" that can be used depending on the context. "Duration" refers to the length of time that something lasts, while "span" refers to the amount of time between two specific events. "Interval" is a term commonly used in music to refer to the space of time between two notes, whereas "epoch" refers to a significant period in history. "Era" is a longer period of time that is defined by specific cultural, political, or social events. "Age" can be used similarly to "era" but is also often used to describe different developmental stages in an individual's life.