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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
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physical entity go
an entity that has physical existence
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matter go
that which has mass and occupies space
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substance go
the real physical matter of which a person or thing consists
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material, stuff go
the tangible substance that goes into the makeup of a physical object
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waste, waste material, waste matter, waste product go
any materials unused and rejected as worthless or unwanted
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pollutant go
waste matter that contaminates the water or air or soil
nitrogen oxide
any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials
noun.substance

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