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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
collagenase
any enzyme that catalyzes the hydrolysis of collagen and gelatin
noun.substance

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