grim vs sibilant

grim

adj
  • Disgusting; gross. 

  • Rigid and unrelenting. 

  • Ghastly or sinister. 

  • Dismal and gloomy, cold and forbidding. 

verb
  • To make grim; to give a stern or forbidding aspect to. 

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