prayer vs theology

prayer

noun
  • A practice of communicating with one's God, or with some spiritual entity. 

  • An act of praying. 

  • The specific words or methods used for praying. 

  • The remotest hope or chance. 

  • A meeting held for the express purpose of praying. 

  • A request; a petition. 

  • One who prays. 

theology

noun
  • An organized method of interpreting spiritual works and beliefs into practical form. 

  • Synonym of religious studies 

  • Subjective marginal details. 

  • The study of God, a god, or gods; and of the truthfulness of religion in general. 

  • A particular belief within a religion. 

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