bold vs sibilant

bold

adj
  • Visually striking; conspicuous. 

  • Naughty; insolent; badly-behaved. 

  • Courageous, daring. 

  • Pornographic; depicting nudity. 

  • Steep or abrupt. 

  • Full-bodied. 

  • Having thicker strokes than the ordinary form of the typeface. 

  • Presumptuous, forward or impudent. 

verb
  • To make (a font or some text) bold. 

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