The East Side is a term commonly used to refer to the eastern part of a city or town. However, there are many synonym options that can be used in place of "East Side". Some of these synonyms include the eastern district, the east end, the eastern section, the east quarter, the east precinct, the eastern borough, and the eastern neighborhood. These terms convey the same meaning and can be used interchangeably to describe the eastern part of a city. Choosing the right synonym depends on the context and personal preference of the speaker or writer.