mustard agent vs sulfur mustard

mustard agent and sulfur mustard both are nouns.

Word	Noun	Adjective	Verb	Adverb
mustard agent	Yes	No	No	No
sulfur mustard	Yes	No	No	No

As nouns, mustard agent and sulfur mustard are synonyms defined as:

mustard agent and sulfur mustard: a toxic war gas with sulfide based compounds that raises blisters and attacks the eyes and lungs; there is no known antidote

Other synonyms of mustard agent include blistering agent, dichloroethyl sulfide, mustard gas.

mustard agent (noun)	sulfur mustard (noun)
a toxic war gas with sulfide based compounds that raises blisters and attacks the eyes and lungs; there is no known antidote	a toxic war gas with sulfide based compounds that raises blisters and attacks the eyes and lungs; there is no known antidote