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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

material, stuff go
the tangible substance that goes into the makeup of a physical object

waste, waste material, waste matter, waste product go
any materials unused and rejected as worthless or unwanted

pollutant go
waste matter that contaminates the water or air or soil

chlorofluorocarbon, CFC go
a fluorocarbon with chlorine

Freon
any one or more chlorofluorocarbons (or related compounds) that are used as an aerosol propellant, organic solvent, or refrigerant

noun.substance

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