W: (n) screening [Related to: screen] (testing objects or persons in order to identify those with particular characteristics)
W: (n) screener [Related to: screen] (a guard at an airport who checks passengers or their luggage at a security checkpoint)
W: (n) sort [Related to: sort] (an operation that segregates items into groups according to a specified criterion) "the bottleneck in mail delivery is the process of sorting"