sibilant vs zizz

sibilant

noun
  • A consonant having a hissing or hushing sound such as the s or sh in sack or shack. 

adj
  • Characterized by a hissing or hushing sound such as the s or sh in sack or shack. 

zizz

noun
  • A buzzing or whizzing sound. 

  • A nap or sleep. 

verb
  • To take a nap. 

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