nerve gas vs VX gas

nerve gas and VX gas both are nouns.

Word	Noun	Adjective	Verb	Adverb
nerve gas	Yes	No	No	No
VX gas	Yes	No	No	No

As nouns, VX gas is a hyponym of nerve gas; that is, VX gas is a word with a more specific, narrower meaning than nerve gas:

nerve gas: a toxic gas that is inhaled or absorbed through the skin and has harmful effects on the nervous and respiratory system
VX gas: a highly lethal nerve agent used in chemical warfare; a toxic liquid that penetrates the skin or lungs to disrupt the nervous system and stop respiration; in combat VX gas is deployed by detonating a container over the target area and can persist in the environment up to several weeks after release

Other hyponyms of nerve gas include organophosphate nerve agent, G-series agent, G-series nerve agent, G agent.

nerve gas (noun)	VX gas (noun)
a toxic gas that is inhaled or absorbed through the skin and has harmful effects on the nervous and respiratory system	a highly lethal nerve agent used in chemical warfare; a toxic liquid that penetrates the skin or lungs to disrupt the nervous system and stop respiration; in combat VX gas is deployed by detonating a container over the target area and can persist in the environment up to several weeks after release