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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

coenzyme go
a small molecule (not a protein but sometimes a vitamin) essential for the activity of some enzymes

nicotinamide adenine dinucleotide, NAD
a coenzyme present in most living cells and derived from the B vitamin nicotinic acid

noun.substance

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