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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

chemical, chemical substance go
material produced by or used in a reaction involving changes in atoms or molecules

softener
a substance added to another to make it less hard

noun.substance

3 Subcategories

conditioner go
a substance used in washing (clothing or hair) to make things softer
plasticizer, plasticiser go
a substance added to plastics or other materials to make them more pliable
water softener go
a substance (such as sodium chloride) that lessens the hardness of water by replacing calcium and magnesium ions with sodium ions and so gives the water more efficient sudsing power