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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

reducer, reducing agent, reductant go
a substance capable of bringing about the reduction of another substance as it itself is oxidized

hydrazine
a colorless fuming corrosive liquid

noun.substance

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