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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

metal, metallic element go
any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

iron, Fe, atomic number 26 go
a heavy ductile magnetic metallic element

cast iron go
an alloy of iron containing so much carbon that it is brittle and so cannot be wrought but must be shaped by casting

pot metal
cast iron used for making cooking wares

noun.substance

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