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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
any substance that causes injury or illness or death of a living organism

noun.substance

3 Subcategories

atropine go
a poisonous crystalline alkaloid extracted from the nightshade family
hyoscyamine go
a poisonous crystalline alkaloid (isometric with atropine but more potent)
toxin go
a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species