guttural vs sibilant

guttural

noun
  • A harsh and throaty spoken sound 

adj
  • Sounding harsh and throaty. 

  • having a place of articulation towards the back of the mouth; in modern use, uvular, pharyngeal, or glottal; in earlier or non-technical use, also including velar. 

  • Of, relating to, or connected to the throat. 

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