observance vs rebellion

observance

noun
  • The practice of complying with a law, custom, command or rule. 

  • That which is to be observed. 

  • Observation or the act of watching. 

  • A rule governing a religious order, especially in the Roman Catholic church. 

  • The custom of celebrating a holiday or similar occasion. 

  • Reverence; homage. 

rebellion

noun
  • Defiance of authority or control; the act of rebelling. 

  • An organized, forceful subversion of the law of the land in an attempt to replace it with another form of government. 

  • Armed resistance to an established government or ruler. 

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