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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
a substance that retards or stops an activity

noun.substance

4 Subcategories

angiotensin II inhibitor go
an agent that retards or restrains the action of angiotensin II
antioxidant go
substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides
anticatalyst go
(chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst
moderator go
any substance used to slow down neutrons in nuclear reactors