mustard gas vs dichloroethyl sulfide

mustard gas and dichloroethyl sulfide both are nouns.

Word	Noun	Adjective	Verb	Adverb
mustard gas	Yes	No	No	No
dichloroethyl sulfide	Yes	No	No	No

As nouns, mustard gas and dichloroethyl sulfide are synonyms defined as:

mustard gas and dichloroethyl sulfide: 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 gas include blistering agent, mustard agent, sulfur mustard.

mustard gas (noun)	dichloroethyl sulfide (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