VX gas is a deadly nerve agent that has been used in several high-profile incidents, including the assassination of Kim Jong-un's half-brother in 2017. There are several synonyms for VX gas that are commonly used in the media and scientific literature. Some of these synonyms include nerve gas, chemical weapon, organophosphate, and cholinesterase inhibitor. Nerve gas is a broad term for any gas that attacks the nervous system, while organophosphate refers to the specific chemical structure of VX gas. Cholinesterase inhibitor is a more technical term that refers to the way in which nerve agents like VX gas disrupt the normal functioning of the nervous system. Regardless of the synonym used, VX gas remains one of the deadliest and most feared chemical weapons in existence.