raspy vs sibilant

raspy

adj

  • Rough, raw, especially of vocal quality. 

  • Irritable. 

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