attacker vs bolsterer

attacker

noun
  • One of the players on a team in football (soccer) in the row nearest to the opposing team's goal, who are therefore principally responsible for scoring goals. 

  • Someone who attacks. 

bolsterer

noun
  • One who, or that which, bolsters. 

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