bertha vs boa

bertha

noun
  • A lace collar that covers the shoulders of a dress 

boa

noun
  • A type of long scarf; typically made from synthetic or real feathers (or occasionally fur), and usually worn by being draped across the shoulders with the ends hanging low, sometimes also with a loop around the neck. 

  • Any of a group of large American snakes, of the genus Boa, subfamily Boinae, or family Boidae, including the boa constrictor and the emperor boa of Mexico. 

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