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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
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physical entity go
an entity that has physical existence
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matter go
that which has mass and occupies space
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substance go
the real physical matter of which a person or thing consists
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activator go
(biology) any agency bringing about activation
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accelerator, catalyst go
(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
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enzyme go
any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions
oxidase
any of the enzymes that catalyze biological oxidation
noun.substance

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