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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

drug go
a substance that is used as a medicine or narcotic

antagonist go
a drug that neutralizes or counteracts the effects of another drug

estrogen antagonist, tamoxifen
an antagonist for estrogen that is used in the treatment of breast cancer

noun.artifact

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