Bacchanalian vs riotous

Bacchanalian

adj
  • Of or pertaining to the festival of Bacchus; relating to or given to reveling and drunkenness. 

noun
  • A bacchanal; a drunken reveler. 

riotous

adj
  • Having the characteristics of a riot. 

  • Unrestrained and boisterous; degenerate or dissolute. 

  • Causing, inciting or taking part in a riot. 

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