hoarse vs sibilant

hoarse

adj
  • Having a dry, harsh tone to the voice, as a result of a sore throat, age, emotion, etc. 

verb
  • To utter hoarsely; to croak. 

sibilant

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

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

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