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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
a heavy ductile magnetic metallic element

noun.substance

11 Subcategories

alpha iron go
a magnetic allotrope of iron
beta iron go
an allotrope of iron that is the same as alpha iron except that it is nonmagnetic
gamma iron go
a nonmagnetic allotrope of iron that is the basis of austenite
delta iron go
an allotrope of iron that is stable between 1403 degrees centigrade and the melting point (= 1532 degrees)
ingot iron go
iron of high purity
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
wrought iron go
iron having a low carbon content that is tough and malleable and so can be forged and welded
galvanized iron go
iron that is coated with zinc to protect it from rust
pig iron go
crude iron tapped from a blast furnace
scrap iron go
iron to be melted again and reworked
structural iron go
iron that has been cast or worked in structural shapes