Mustard gas and Vesicatory

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.

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

Vesicatory noun - A chemical agent that causes blistering (especially mustard gas).

Mustard gas and vesicatory are semantically related. Sometimes you can replace phrase "Mustard gas" with "Vesicatory", this terms are similar.