chemical bomb, gas bomb - a bomb laden with chemical agents that are released when the bomb explodes

pepper spray - a nonlethal aerosol spray made with the pepper derivative oleorsein capiscum; used to cause temporary blindness and incapacitate an attacker; also used as a bear deterrent

W.M.D., weapon of mass destruction, WMD - a weapon that kills or injures civilian as well as military personnel (nuclear and chemical and biological weapons)

poison gas - a gas that is poisonous to breath or contact; used in chemical warfare

lachrymator, lacrimator, tear gas, teargas - a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds