Sticker

Part of speech: noun (n.)

1. One who, or that which, sticks; as, a bill sticker.

2. That which causes one to stick; that which puzzles or poses. [Colloq.] Tackeray.

3. In the organ, a small wooden rod which connects (in part) a key and a pallet, so as to communicate motion by pushing.

4. Same as Paster, 2. [Political Cant, U.S.]