banner vs placard

banner

verb
  • To display as a banner headline. 

  • To adorn with a banner. 

adj
  • Exceptional; very good. 

noun
  • A large piece of cloth with a slogan, motto, or emblem carried in a demonstration or other procession or suspended in some conspicuous place. 

  • The title of a newspaper as printed on its front page; the nameplate; masthead. 

  • A type of administrative division in Inner Mongolia and Tuva, made during the Qing dynasty; at that time, Outer Mongolia and part of Xinjiang were also divided into banners. 

  • A cause or purpose; a campaign or movement. 

  • A military or administrative subdivision. 

  • A type of advertisement on a web page or on television, usually taking the form of a graphic or animation above or alongside the content. 

  • The military unit under such a flag or standard. 

  • The principal standard of a knight. 

  • One who bans something. 

  • A flag or standard used by a military commander, monarch or nation. 

  • Any large sign, especially when made of soft material or fabric. 

placard

verb
  • To announce with placards. 

  • To affix a placard to. 

noun
  • A kind of stomacher, often adorned with jewels, worn in the fifteenth century and later. 

  • An extra plate on the lower part of the breastplate or backplate of armour. 

  • The woodwork and frame of the door of a closet etc. 

  • A sheet of paper or cardboard with a written or printed announcement on one side for display in a public place. 

How often have the words banner and placard occurred in a corpus of books? (source: Google Ngram Viewer )