sibilant vs thunderous

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. 

thunderous

adj
  • Very loud; that sounds like thunder; thundersome. Also in metaphorical expressions, signifying fury. 

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