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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

thing go
a separate and self-contained entity

unit, building block go
a single undivided natural thing occurring in the composition of something else

molecule go
(physics and chemistry) the simplest structural unit of an element or compound

macromolecule, supermolecule
any very large complex molecule

noun.substance

4 Subcategories

protein go
any of a large group of nitrogenous organic compounds that are essential constituents of living cells
sugar, carbohydrate, saccharide go
an essential structural component of living cells and source of energy for animals
lipid, lipide, lipoid go
an oily organic compound insoluble in water but soluble in organic solvents
nucleic acid go
(biochemistry) any of various macromolecules composed of nucleotide chains that are vital constituents of all living cells