Asphyxiants refer to substances that can reduce the supply of oxygen to the body or brain, resulting in suffocation, coma, and even death. Synonyms for asphyxiants include suffocating agents, choking agents, breath-hindering substances, and oxygen-depletion agents. Asphyxiants can come in the form of gases such as carbon monoxide, nitrogen, and methane, as well as chemicals like cyanide and hydrogen sulfide. It is important to exercise caution when working with or around asphyxiants, as exposure to these substances can be deadly. Proper ventilation and safety equipment are essential measures to ensure a safe work environment.