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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
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physical entity go
an entity that has physical existence
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matter go
that which has mass and occupies space
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substance go
the real physical matter of which a person or thing consists
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atom go
(physics and chemistry) the smallest component of an element having the chemical properties of the element
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isotope go
one of two or more atoms with the same atomic number but with different numbers of neutrons
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radioisotope go
a radioactive isotope of an element
iodine-131
heavy radioactive isotope of iodine with a half-life of 8 days
noun.substance

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