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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

medium go
(biology) a substance in which specimens are preserved or displayed

contrast medium, contrast material
a substance that is opaque to x-rays

noun.substance

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