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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

atom go
(physics and chemistry) the smallest component of an element having the chemical properties of the element

hydrogen atom go
an atom of hydrogen

acidic hydrogen, acid hydrogen
a hydrogen atom in an acid that forms a positive ion when the acid dissociates

noun.substance

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