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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

isotope go
one of two or more atoms with the same atomic number but with different numbers of neutrons

radioisotope go
a radioactive isotope of an element

label
a radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction

noun.substance

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