There are several synonyms for the word "ectostosis," which refers to the formation of a natural bony growth on the outer surface of a bone. Some synonyms include "exostosis," "hyperostosis," and "osteoma." Exostosis is the most commonly used synonym and is often used to describe small, benign growths that develop on bones, typically in response to pressure or stress on the area. Hyperostosis refers to excessive bone growth and is usually used in cases of bone disorders such as Paget's disease. Osteoma is a synonym used to describe a benign tumor made up of bone tissue. Regardless of the synonym used, treatment for ectostosis usually involves monitoring the growth and surgical removal only if it causes pain or limited motion.