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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

antacid, gastric antacid, alkalizer, alkaliser, antiacid go
an agent that counteracts or neutralizes acidity (especially in the stomach)

Rolaids
an antacid

noun.substance

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