Dionysiac vs Dionysian

Dionysiac

adj

  • Of, or relating to Dionysus or to the Dionysia. 

Dionysian

adj

  • Of or pertaining to Dionysus. 

noun

  • A follower of Dionysus. 

  • One who is dionysian. 

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