guffaw vs snigger

guffaw

noun

  • A boisterous laugh. 

verb

  • To laugh boisterously. 

snigger

noun

  • A partly suppressed or broken laugh. 

  • A sly or snide laugh. 

verb

  • To emit a snigger. 

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