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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

sorbent, sorbent material go
a material that sorbs another substance

absorbent material, absorbent
a material having capacity or tendency to absorb another substance

noun.substance

3 Subcategories

sponge go
a porous mass of interlacing fibers that forms the internal skeleton of various marine animals and usable to absorb water or any porous rubber or cellulose product similarly used
absorber go
(physics) material in a nuclear reactor that absorbs radiation
absorbent cotton go
cotton made absorbent by removal of the natural wax