Synonyms and related words :
acetylene, ammonia, argon, asphyxiating gas, butane, carbon dioxide, carbon monoxide, chlorine, coal gas, ethane, ether, ethylene, fluorine, formaldehyde, helium, hydrogen, illuminating gas, krypton, lewisite, marsh gas, methane, mustard gas, natural gas, neon, nitrogen, ozone, poison gas, propane, radon, sewer gas, xenon