bobble vs tremble

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. 

tremble

noun
  • A shake, quiver, or vibration. 

verb
  • To shake, quiver, or vibrate. 

  • To fear; to be afraid. 

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