Anesthetics are substances that are used to reduce or eliminate pain during medical procedures, such as surgeries, injections, or dental work. There are several synonyms that can be used to refer to anesthetics, including painkillers, sedatives, tranquilizers, numbing agents, and sleep inducers. Painkillers are drugs that help to alleviate pain, while sedatives and tranquilizers are substances that are used to calm and relax a patient. Numbing agents work by blocking nerve signals to the brain, and sleep inducers are medications that promote sleep and relaxation. While all of these synonyms refer to substances that help to reduce pain and discomfort during medical procedures, they may vary in their specific mechanism of action and effects on the body.