Myriameter is a term used to measure distance that is equivalent to 10 kilometers. However, there are different words that can be used as a synonym for this term. One of the most common synonyms for myriameter is the word "dekameter". The word "myriametre" is also another synonym that is used interchangeably with myriameter in some parts of the world. Additionally, myriameter can be referred to as a "ten-thousand-meter" or "ten-thousand-step" measure. Regardless of which synonym is used, it is important to keep in mind that the myriameter is a metric unit that is commonly used to measure long distances.