Viking vs raider

Viking

noun
  • A player on the Minnesota Vikings NFL team. 

  • A stock character common in the fantasy genre, namely a barbarian, generally equipped with an axe or sword and a helmet adorned with horns. 

  • A Norseman (medieval Scandinavian). 

  • An ethnic Swede, Norwegian, Dane, Icelander or Faroe Islander. 

  • Scandinavian/Northern European seafarers, most familiarly raiders and pirates during the Viking age. 

name
  • A sea area between Scotland and Norway 

  • A city in Minnesota 

  • A town in Alberta, Canada 

raider

noun
  • A warship which is light, maneuverable, and fast-moving. 

  • A law enforcement official who conducts a raid on a building in search for illicit goods. 

  • A person who uncovers evidence of improper behavior within governmental or private organizations. 

  • One who engages in a raid; a plunderer. 

  • A person who takes or attempts to take control of a firm against the will of current management by purchasing a controlling interest of stock and acquiring proxies. 

  • A special forces operative; a commando. 

  • A warplane on an air raid. 

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