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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
a particular kind or species of matter with uniform properties

fuel go
a substance that can be consumed to produce energy

fossil fuel go
fuel consisting of the remains of organisms preserved in rocks in the earth's crust with high carbon and hydrogen content

coal
fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period

noun.substance

4 Subcategories

anthracite, anthracite coal, hard coal go
a hard natural coal that burns slowly and gives intense heat
bituminous coal, soft coal go
rich in tarry hydrocarbons
wood coal, lignite, brown coal go
intermediate between peat and bituminous coal
steam coal go
coal suitable for use under steam boilers