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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

accelerator, catalyst go
(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

enzyme go
any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions

complement
one of a series of enzymes in the blood serum that are part of the immune response

noun.substance

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