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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 go
any substance that propels

compressed gas go
gas at a high pressure that can be used as a propellant

compressed air
air at a pressure greater than that of the atmosphere

noun.substance

1 Subcategories

air cushion go
the trapped air that supports a hovercraft a short distance above the water or ground