growling vs sibilant

growling

noun
  • A sustained instance of growls or guttural noises. 

  • The technique of producing a low-pitched growling or rumbling sound on a wind instrument. 

adj
  • Producing a growl. 

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 growling and sibilant occurred in a corpus of books? (source: Google Ngram Viewer )