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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
a particular kind or species of matter with uniform properties

inhibitor go
a substance that retards or stops an activity

moderator go
any substance used to slow down neutrons in nuclear reactors

heavy water, deuterium oxide
water containing a substantial proportion of deuterium atoms, used in nuclear reactors

noun.substance

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