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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

element, chemical element go
any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

carbon, C, atomic number 6 go
an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond

radiocarbon, carbon 14
a radioactive isotope of carbon

noun.substance

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