Co-driver is a term commonly used to describe a person who assists the driver of a vehicle. However, there are various synonyms for this term that can be used interchangeably in different contexts. Some popular synonyms for co-driver include navigator, assistant driver, copilot, shotgun rider, and front seat passenger. These words convey the person's role in supporting the driver and ensuring a successful journey. The term navigator implies that the person provides direction and helps the driver navigate their way. Assistant driver suggests that the person can take over driving duties if necessary. Copilot implies that the person is a trustworthy partner who supports the driver through difficult situations. Shotgun rider and front-seat passenger refer to the person's physical location in the vehicle.