snigger vs sniggle

snigger

verb
  • To emit a snigger. 

noun
  • A partly suppressed or broken laugh. 

  • A sly or snide laugh. 

sniggle

verb
  • To ensnare. 

  • To fish for eels by thrusting a baited hook into their dens. 

  • To catch by this means. 

  • To chortle or chuckle; snicker. 

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