Propugn :: Propugn (v. t.) To contend for; to defend; to vindicate.
Propulsation :: Propulsation (n.) The act of driving away or repelling; a keeping at a distance.
Propulse :: Propulse (v. t.) To repel; to drive off or away.
Propulsion :: Propulsion (n.) The act driving forward or away; the act or process of propelling; as, steam propulsion..
Propulsive :: Propulsive (a.) Tending, or having power, to propel; driving on; urging..