bowler vs sunbonnet

bowler

noun
  • A bowler hat; a round black hat formerly popular among British businessmen. 

  • One who engages in the sport of bowling. 

  • The pitcher. 

  • A player selected mainly for his bowling ability. 

  • The player currently bowling. 

sunbonnet

noun
  • A hat (bonnet) worn for protection from bright sunlight. 

  • A plant of the genera Leibnitzia or Chaptalia, native to Asia and the Americas. 

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