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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
a particular kind or species of matter with uniform properties

poison, toxicant, poisonous substance go
any substance that causes injury or illness or death of a living organism

toxin go
a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species

neurotoxin, neurolysin go
any toxin that affects neural tissues

saxitoxin
a powerful neurotoxin produced by certain dinoflagellates found in red tides

noun.substance

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