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

steam coal
coal suitable for use under steam boilers

noun.substance

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