bertha vs poncho

bertha

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

poncho

noun
  • A simple garment, made from a rectangle of cloth, with a slit in the middle for the head. 

  • A similar waterproof garment, today typically of rubber with a hood. 

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