Waywiser, which means an instrument or device for measuring distances traveled, has several synonyms that can be used interchangeably in different contexts. Some of these synonyms include odometer, pedometer, mileometer, distance meter, and road measurer. An odometer is a device that measures the distance traveled by a vehicle, usually on a wheel or rotation basis. On the other hand, a pedometer is a device that measures the number of steps taken by a person. A mileometer is a device that records the distance traveled by a vehicle in miles, and a distance meter is a tool that measures the distance between two locations. Lastly, a road measurer is a device that measures the length and width of roads and the distances between different landmarks.