How do you spell Sticker

Available Definitions:
1)  n. - One who, or that which, sticks; as, a bill sticker.
2)  n. - That which causes one to stick; that which puzzles or poses.
3)  n. - In the organ, a small wooden rod which connects (in part) a key and a pallet, so as to communicate motion by pushing.
4)  n. - Same as Paster, 2.