Chemical agent and Vesicatory

Chemical agent noun - An agent that produces chemical reactions.

Vesicatory and chemical agent are semantically related. In some cases you can replace term "Vesicatory" with "Chemical agent", this terms are similar.

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

Chemical agent and vesicatory are semantically related. You can use "Chemical agent" instead a noun "Vesicatory".