Lacrimator refers to a chemical compound that causes tearing and irritation in the eyes when it's released into the air. It's commonly used in riot control and as a defense mechanism against predators. There are several synonyms for lacrimator, including tear gas, lachrymator, tear agent, irritant smoke, and pepper spray. Tear gas and lachrymator are perhaps the most commonly used synonyms for lacrimator. They're both chemical irritants that affect the eyes, lungs, and skin, causing pain, tearing, and inflammation. On the other hand, pepper spray contains capsaicin, an oily resin extracted from peppers, which causes intense burning and irritation in the eyes and skin.