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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

compound, chemical compound go
(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

hydroxide, hydrated oxide
a compound of an oxide with water

noun.substance

5 Subcategories

aluminum hydroxide, aluminium hydroxide, hydrated aluminum oxide, hydrated aluminium oxide go
white crystalline compound that occurs naturally as the mineral gibbsite
lime, calcium hydroxide, slaked lime, hydrated lime, calcium hydrate, caustic lime, lime hydrate go
a caustic substance produced by heating limestone
magnesium hydroxide go
a white crystalline powder used chiefly in medicines
potash, caustic potash, potassium hydroxide go
a potassium compound often used in agriculture and industry
sodium hydroxide, caustic soda go
a strongly alkaline caustic used in manufacturing soap and paper and aluminum and various sodium compounds