Tranquillity :: Tranquillity (n.) The quality or state of being tranquil; calmness; composure.
Tranquillization :: Tranquillization (n.) The act of tranquilizing, or the state of being tranquilized..
Tranquillize :: Tranquillize (v. t.) To render tranquil; to allay when agitated; to compose; to make calm and peaceful; as, to tranquilize a state disturbed by factions or civil commotions; to tranquilize the mind..
Tranquillizer :: Tranquillizer (n.) One who, or that which, tranquilizes..