herald vs true bug

herald

noun
  • A moth of the species Scoliopteryx libatrix. 

  • A harbinger, giving signs of things to come. 

  • A handbill consisting of an advertisement. 

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

  • A messenger, especially one bringing important news. 

verb
  • To proclaim or announce an event. 

  • To greet something with excitement; to hail. 

true bug

noun
  • Any of various insects of the order Hemiptera and in particular of the suborder Heteroptera, that are wingless or have two pairs of wings, and have mouthparts adapted for piercing and sucking. 

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