propellent(n = noun.substance) propellant - any substance that propels;
is a kind of substance
has particulars: rocket fuel, rocket propellant, rocket propellent, compressed gas
Derived forms verb propel₁, adjective propellent₁

   propellent(s = adj.all) propellant, propelling, propulsive - tending to or capable of propelling; "propellant fuel for submarines"; "the faster a jet plane goes the greater its propulsive efficiency"; "universities...the seats of propulsive thought"
Derived forms verb propel₁, noun propellent₁

propellent, adj. propelling; capable of driving or pushing forward.

rocket propellent