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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

material, stuff go
the tangible substance that goes into the makeup of a physical object

chemical, chemical substance go
material produced by or used in a reaction involving changes in atoms or molecules

compound, chemical compound go
(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

organic compound go
any compound of carbon and another element or a radical

neurochemical go
any organic substance that occurs in neural activity

neurotransmitter
a neurochemical that transmits nerve impulses across a synapse

noun.substance

3 Subcategories

epinephrine, epinephrin, adrenaline, Adrenalin go
a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin)
gamma aminobutyric acid, GABA go
an amino acid that is found in the central nervous system
acetylcholine go
a neurotransmitter that is a derivative of choline