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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

matter go
that which has mass and occupies space

substance go
the real physical matter of which a person or thing consists

activator go
(biology) any agency bringing about activation

sensitizer, sensitiser
(chemistry) a substance other than a catalyst that facilitates the start of a catalytic reaction

noun.substance

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