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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
(biology) any agency bringing about activation

noun.substance

3 Subcategories

activating agent go
(mineral extraction) a surface-active chemical used in flotation process to increase the attraction to a specific mineral
accelerator, catalyst go
(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
sensitizer, sensitiser go
(chemistry) a substance other than a catalyst that facilitates the start of a catalytic reaction