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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

nerve gas, nerve agent
a toxic gas that is inhaled or absorbed through the skin and has harmful effects on the nervous and respiratory system

noun.substance

2 Subcategories

VX gas go
a highly lethal nerve agent used in chemical warfare
organophosphate nerve agent go
any of a series of nerve agents containing organophosphate compounds first synthesized by German chemists in 1936