picker

Short definition from Wiktionary

Noun

1. 1
   Agent noun of pick; one who picks.
2. 2
   Agent noun of pick; one who picks: A worker responsible for picking or retrieving ordered items, etc.
3. 3
   Any user interface control that selects something.
4. 4
   A machine for picking fibrous materials to pieces so as to loosen and separate the fibre.
5. 5
   The piece in a loom that strikes the end of the shuttle and impels it through the warp.
6. 6
   A priming wire for cleaning the vent, in ordnance.
7. 7
   A fragment of gold smaller than a nugget but large enough to be picked up.
8. 8
   One who removes defects from and finishes electrotype plates.
9. 9
   A pilferer.

Proper noun

1. 1
   A surname.