Sulfur compounds refer to chemical compounds that contain sulfur in their molecular structure. These compounds can be found in various natural and synthetic products, including foods, medicines, and industrial chemicals. However, there are antonyms for the term sulfur compounds, which are substances that do not contain sulfur, such as oxygen compounds, nitrogen compounds, and carbon compounds. Oxygen compounds are compounds that contain oxygen in their molecular structure, such as water, carbon dioxide, and hydrogen peroxide. Nitrogen compounds, on the other hand, are chemical compounds that contain nitrogen in their molecular structure, such as ammonia, nitrous oxide, and nitrogen gas. Carbon compounds, also known as organic compounds, are compounds that contain carbon in their molecular structure, such as carbohydrates, lipids, and proteins.