bobble vs chirl

bobble

noun
  • A wobbling motion. 

  • A pill (a ball formed on the surface of the fabric, as on laundered clothes). 

  • A localized set of stitches forming a raised bump. 

  • A furry ball attached on top of a hat. 

  • Elasticated band used for securing hair (for instance in a ponytail), a hair tie 

verb
  • To bob up and down. 

  • To make a mistake in. 

  • To roll slowly. 

chirl

noun
  • A kind of musical warble. 

verb
  • To emit a low sound; to warble. 

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