gnar vs sibilate

gnar

verb

  • To snarl or growl. 

noun

  • Snow or an ocean wave. 

adj

  • Gnarly. 

sibilate

verb

  • To speak with a hissing sound. 

  • To hiss. 

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