Mustard gas and Nerve gas

Mustard gas noun - A toxic war gas with sulfide based compounds that raises blisters and attacks the eyes and lungs; there is no known antidote.

Nerve gas and mustard gas are semantically related In some cases you can use "Nerve gas" instead a noun phrase "Mustard gas".

Nerve gas noun - A toxic gas that is inhaled or absorbed through the skin and has harmful effects on the nervous and respiratory system.

Mustard gas and nerve gas are semantically related in poisonous gas topic. You can use "Mustard gas" instead a noun phrase "Nerve gas".