discordant vs sibilant

discordant

adj
  • Harsh or dissonant-sounding. 

  • Not in harmony or accord. 

  • Of opposite sign. 

  • Of a differing type of rock cutting across a formation. 

  • Serodiscordant. 

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