Quicksand :: Quicksand (n.) Sand easily moved or readily yielding to pressure; especially, a deep mass of loose or moving sand mixed with water, sometimes found at the mouth of a river or along some coasts, and very dangerous, from the difficulty of extricating a person who begins sinking into it..
Quickset :: Quickset (n.) A living plant set to grow, esp. when set for a hedge; specifically, the hawthorn..