Chordoma is a type of cancer that occurs in the bones of the skull and spine. It is a rare type of cancer and treatment options vary depending on the location and size of the tumor. Some synonyms for chordoma include chondrosarcoma, osteosarcoma, and Ewing sarcoma. These cancers also affect the bones and can cause similar symptoms. However, they are different from chordoma in terms of their location, growth pattern, and the type of cells that they originate from. It is important to obtain an accurate diagnosis of any bone cancer so that the appropriate treatment can be administered.