Vulcanite is a term that refers to a hard and durable material that is formed by the vulcanization process. This process involves adding sulfur to natural rubber and heating it, resulting in a solid and strong material that is used for a variety of purposes. Some synonyms for vulcanite include ebonite, hard rubber, and black rubber. Ebonite is a type of vulcanite that is particularly dense and has a black surface that looks like ebony wood. Hard rubber is another term used to describe vulcanite, as it is hard and resistant to abrasion. Black rubber is also a synonym for vulcanite, as it is typically dark in color and has a similar texture and hardness.