poster
 oxford
 views  updated May 18 2018post·er  / ˈpōstər/ •
n. 1. a large printed picture used for decoration. ∎  a large printed picture, notice, or advertisement displayed in a public place: [as  adj.] a poster campaign. 2.  Comput.  someone who sends a message to a newsgroup.
 The Oxford Pocket Dictionary of Current English