ceremonial vs ceremonious

ceremonial

adj
  • Of, relating to, or used in a ceremony. 

noun
  • A ceremony, or series of ceremonies, prescribed by ritual. 

ceremonious

adj
  • Fond of ceremony, ritual or strict etiquette; punctilious 

  • Characterized by ceremony or rigid formality 

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