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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

causal agent, cause, causal agency go
any entity that produces an effect or is responsible for events or results

agent go
a substance that exerts some force or effect

chemical agent go
an agent that produces chemical reactions

vesicant, vesicatory
a chemical agent that causes blistering (especially mustard gas)

noun.substance

1 Subcategories

mustard gas, mustard agent, blistering agent, dichloroethyl sulfide, sulfur mustard go
a toxic war gas with sulfide based compounds that raises blisters and attacks the eyes and lungs