chirr vs sibilant

chirr

noun
  • The trilled sound made by an insect. 

verb
  • To make the prolonged trilling sound of an insect (e.g. a grasshopper, a cicada). 

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. 

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