hopper

Concise Oxford English Dictionary © 2008 Oxford University Press:
hopper1

▶noun

• 1 a container for loose bulk material, typically tapering downward and discharging its contents at the bottom.

  ■ a tapering container, working with a hopping motion, through which grain passes into a mill.

• 2 a railway wagon able to discharge bulk material through its floor.

• 3 a barge for carrying away and discharging mud from a dredging machine.

• 4 a person or thing that hops.

  ■ a hopping insect, especially a young locust.

Concise Oxford English Dictionary © 2008 Oxford University Press:
hopper2

▶noun a person who picks hops.