herald vs predecessor

herald

noun
  • An official whose speciality is heraldry, especially one between the ranks of pursuivant and king-of-arms. 

  • A harbinger, giving signs of things to come. 

  • A handbill consisting of an advertisement. 

  • A messenger, especially one bringing important news. 

  • A moth of the species Scoliopteryx libatrix. 

verb
  • To proclaim or announce an event. 

  • To greet something with excitement; to hail. 

predecessor

noun
  • One who precedes; one who has preceded another in any state, position, office, etc.; one whom another follows or comes after, in any office or position. 

  • A model or type of machinery or device which precedes the current (or later) one. Usually used to describe an earlier, outdated model. 

  • A vertex having a directed path to another vertex 

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