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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

propellant, propellent
any substance that propels

noun.substance

2 Subcategories

rocket fuel, rocket propellant, rocket propellent go
an explosive charge that propels a rocket
compressed gas go
gas at a high pressure that can be used as a propellant