Lachrymator is a chemical compound that irritates the eyes and causes tears to flow. It is often used in tear gas to disperse crowds or control riots. However, there are other words that can be used to describe this type of substance. One such synonym is irritant, which refers to any substance that induces a physical or chemical reaction in the body. Another word is lacrimator, which is derived from the Latin word for tears. Additionally, stinging agent and tear gas are commonly used to describe lachrymators, as they cause severe discomfort and tears in those exposed to them. Overall, lachrymator is just one of many words that describe substances that can cause eye irritation and tears.