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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

lactogen
any agent that enhances milk production

noun.substance

1 Subcategories

prolactin, lactogenic hormone, luteotropin go
gonadotropic hormone secreted by the anterior pituitary